Instructions: 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: Many plants respond to the days growing shorter in the fall by going dormant., Fact2: Fall starts in September and is windy and dry., Question: when do plants respond to shorter days by going dormant? (A) September (B) July (C) trees (D) legumes (E) Conifers (F) Exfoliation (G) Winter (H) Summer
Output:
A