Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Tobacco smoking (including secondhand smoke) and short-term exposure to air pollution such as carbon monoxide, nitrogen dioxide, and sulfur dioxide (but not ozone) have been associated with MI. Other factors that increase the risk of MI and are associated with worse outcomes after an MI include lack of physical activity and psychosocial factors including low socioeconomic status, social isolation, and negative emotions. Shift work is also associated with a higher risk of MI. Acute and prolonged intake of high quantities of alcoholic drinks (3-4 or more) increase the risk of a heart attack.
What forms of air pollution does smoking tobacco cause?
A: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Carthage was Palermo’s major trading partner under the Phoenicians and the city enjoyed a prolonged peace during this period. Palermo came into contact with the Ancient Greeks between the 6th and the 5th centuries BC which preceded the Sicilian Wars, a conflict fought between the Greeks of Syracuse and the Phoenicians of Carthage for control over the island of Sicily. During this war the Greeks named the settlement Panormos (Πάνορμος) from which the current name is derived, meaning "all port" due to the shape of its coast. It was from Palermo that Hamilcar I's fleet (which was defeated at the Battle of Himera) was launched. In 409 B.C. the city was looted by Hermocrates of Syracuse. The Sicilian Wars ended in 265 BC when Carthage and Syracuse stopped warring and united in order to stop the Romans from gaining full control of the island during the First Punic War. In 276 BC, during the Pyrrhic War, Panormos briefly became a Greek colony after being conquered by Pyrrhus of Epirus, but returned to Phoenician Carthage in 275. In 254 BC Panormos was besieged and conquered by the Romans in the first battle of Panormus (the name Latin name). Carthage attempted to reconquer Panormus in 251 BC but failed.
Who had a period of peace under Carthage?
A: unanswerable

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Other popular sites for pop-artist performances include the 3,000-seat Teatro Metropolitan, the 15,000-seat Palacio de los Deportes, and the larger 50,000-seat Foro Sol Stadium, where popular international artists perform on a regular basis. The Cirque du Soleil has held several seasons at the Carpa Santa Fe, in the Santa Fe district in the western part of the city. There are numerous venues for smaller musical ensembles and solo performers. These include the Hard Rock Live, Bataclán, Foro Scotiabank, Lunario, Circo Volador and Voilá Acoustique. Recent additions include the 20,000-seat Arena Ciudad de México, the 3,000-seat Pepsi Center World Trade Center, and the 2,500-seat Auditorio Blackberry.
How many sets are in the Teatro Metropolitan?
A: 3,000

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Most CBC television stations, including those in the major cities, are owned and operated by the CBC itself. CBC O&O stations operate as a mostly seamless national service with few deviations from the main network schedule, although there are some regional differences from time to time. For on-air identification, most CBC stations use the CBC brand rather than their call letters, not identifying themselves specifically until sign-on or sign-off (though some, like Toronto's CBLT, do not ID themselves at all except through PSIP). All CBC O&O stations have a standard call letter naming convention, in that the first two letters are "CB" (an ITU prefix allocated not to Canada, but to Chile) and the last letter is "T". Only the third letter varies from market to market; however, that letter is typically the same as the third letter of the CBC Radio One and CBC Radio 2 stations in the same market. An exception to this rule are the CBC North stations in Yellowknife, Whitehorse and Iqaluit, whose call signs begin with "CF" due to their historic association with the CBC's Frontier Coverage Package prior to the advent of microwave and satellite broadcasting.
What station does not identify itself by its call letters?
A:
Toronto's CBLT