Input: Read this: In comparison to the principal alternative, the diesel engine, electric railways offer substantially better energy efficiency, lower emissions and lower operating costs. Electric locomotives are usually quieter, more powerful, and more responsive and reliable than diesels. They have no local emissions, an important advantage in tunnels and urban areas. Some electric traction systems provide regenerative braking that turns the train's kinetic energy back into electricity and returns it to the supply system to be used by other trains or the general utility grid. While diesel locomotives burn petroleum, electricity is generated from diverse sources including many that do not produce carbon dioxide such as nuclear power and renewable forms including hydroelectric, geothermal, wind and solar.
Question: Which locomotives have no global emissions?

Output: unanswerable


Input: Read this: A 2009 Cochrane review concluded that thiazide antihypertensive drugs reduce the risk of death (RR 0.89), stroke (RR 0.63), coronary heart disease (RR 0.84), and cardiovascular events (RR 0.70) in people with high blood pressure. In the ensuring years other classes of antihypertensive drug were developed and found wide acceptance in combination therapy, including loop diuretics (Lasix/furosemide, Hoechst Pharmaceuticals, 1963), beta blockers (ICI Pharmaceuticals, 1964) ACE inhibitors, and angiotensin receptor blockers. ACE inhibitors reduce the risk of new onset kidney disease [RR 0.71] and death [RR 0.84] in diabetic patients, irrespective of whether they have hypertension.
Question: What do ACE inhibitors do?

Output: reduce the risk of new onset kidney disease [RR 0.71] and death [RR 0.84] in diabetic patients


Input: Read this: The United States Army (USA) is the largest branch of the United States Armed Forces and performs land-based military operations. It is one of the seven uniformed services of the United States and is designated as the Army of the United States in the United States Constitution, Article 2, Section 2, Clause 1 and United States Code, Title 10, Subtitle B, Chapter 301, Section 3001. As the largest and senior branch of the U.S. military, the modern U.S. Army has its roots in the Continental Army, which was formed (14 June 1775) to fight the American Revolutionary War (1775–83)—before the U.S. was established as a country. After the Revolutionary War, the Congress of the Confederation created the United States Army on 3 June 1784, to replace the disbanded Continental Army. The United States Army considers itself descended from the Continental Army, and dates its institutional inception from the origin of that armed force in 1775.
Question: How many uniformed services are there in Canada?

Output: unanswerable


Input: Read this: During this time, Link also helps Midna find the Fused Shadows, fragments of a relic containing powerful dark magic. In return, she helps Link find Ordon Village's children while helping the monkeys of Faron, the Gorons of Eldin, and the Zoras of Lanayru. Once Link has restored the Light Spirits and Midna has all the Fused Shadows, they are ambushed by Zant. After he relieves Midna of the Fused Shadow fragments, she ridicules him for abusing his tribe's magic, but Zant reveals that his power comes from another source as he uses it to turn Link back into a wolf, and then leaves Midna in Hyrule to die from the world's light. Bringing a dying Midna to Zelda, Link learns he needs the Master Sword to return to human form. Zelda sacrifices herself to heal Midna with her power before vanishing mysteriously. Midna is moved by Zelda's sacrifice, and begins to care more about Link and the fate of the light world.
Question: What weapon can transform Link back to his original self?

Output:
Master Sword