Definition: 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: Fact1: astronauts require preserved food for extended flights, Fact2: Custom foods and meals can be created., Question: What do astronauts need for extended flights? (A) hydrogen and oxygen (B) preserved meals (C) solid, liquid, gas (D) small meals (E) fresh meals (F) Dehydration (G) nutrients (H) surprise meals
Output:
B