In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Input: Consider Input: Fact1: heating salt water causes the water to evaporate while the salt remains, Fact2: Flash evaporators are used to make fresh water from salt water., Question: Doing what to salt water causes the water to become fresh water? (A) watershred (B) freezing (C) Regrows it (D) migrate (E) pouring (F) heating (G) cooling (H) erosion

Output: F


Input: Consider Input: Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Iron rusts in the presence of oxygen and water., Question: Exposure to oxygen and water can cause iron to  (A) decrease strength (B) melt (C) uncontrollable burning (D) thermal expansion (E) turn orange on the surface (F) vibrate (G) Extremes of temperature (H) levitate

Output: E


Input: Consider Input: Fact1: hydropower requires damming a river, Fact2: Hydropower is a renewable, economical source of electricity., Question: what does a renewable, economical source of electricity require? (A) damming a river (B) power stations (C) freezing h2o (D) electricity (E) burning fossil fuels (F) hydrogen and oxygen (G) sunlight (H) nuclear meltdowns


Output: A