Input: Read this: By the mid-18th century, Charles Town had become a bustling trade center, the hub of the Atlantic trade for the southern colonies. Charles Towne was also the wealthiest and largest city south of Philadelphia, in part because of the lucrative slave trade. By 1770, it was the fourth-largest port in the colonies, after Boston, New York, and Philadelphia, with a population of 11,000—slightly more than half of them slaves. By 1708, the majority of the colony's population was slaves, and the future state would continue to be a majority of African descent until after the Great Migration of the early 20th century.
Question: What unlucrative trade contributed greatly to Charles Town's growth?

Output: unanswerable


Input: Read this: Inappropriate antibiotic treatment and overuse of antibiotics have contributed to the emergence of antibiotic-resistant bacteria. Self prescription of antibiotics is an example of misuse. Many antibiotics are frequently prescribed to treat symptoms or diseases that do not respond to antibiotics or that are likely to resolve without treatment. Also, incorrect or suboptimal antibiotics are prescribed for certain bacterial infections. The overuse of antibiotics, like penicillin and erythromycin, has been associated with emerging antibiotic resistance since the 1950s. Widespread usage of antibiotics in hospitals has also been associated with increases in bacterial strains and species that no longer respond to treatment with the most common antibiotics.
Question: What are the two biggest reasons for resistance?

Output: Inappropriate antibiotic treatment and overuse


Input: Read this: Before the advent of the ASA system, the system of Weston film speed ratings was introduced by Edward Faraday Weston (1878–1971) and his father Dr. Edward Weston (1850–1936), a British-born electrical engineer, industrialist and founder of the US-based Weston Electrical Instrument Corporation, with the Weston model 617, one of the earliest photo-electric exposure meters, in August 1932. The meter and film rating system were invented by William Nelson Goodwin, Jr., who worked for them and later received a Howard N. Potts Medal for his contributions to engineering.
Question: What did Howard N. Potts invent in 1932?

Output: unanswerable


Input: Read this: There are many geological issues concerning the rivers and streams of the Appalachians. In spite of the existence of the Great Appalachian Valley, many of the main rivers are transverse to the mountain system axis. The drainage divide of the Appalachians follows a tortuous course which crosses the mountainous belt just north of the New River in Virginia. South of the New River, rivers head into the Blue Ridge, cross the higher Unakas, receive important tributaries from the Great Valley, and traversing the Cumberland Plateau in spreading gorges (water gaps), escape by way of the Cumberland River and the Tennessee River rivers to the Ohio River and the Mississippi River, and thence to the Gulf of Mexico. In the central section, north of the New River, the rivers, rising in or just beyond the Valley Ridges, flow through great gorges to the Great Valley, and then across the Blue Ridge to tidal estuaries penetrating the coastal plain via the Roanoke River, James River, Potomac River, and Susquehanna River.
Question: What is the name of the drainage divide?

Output:
unanswerable