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").
Q: Fact1: cold fronts cause thunderstorms as they pass by, Fact2: All thunderstorms produce lightning., Question: Cold fronts cause what? (A) lightning (B) Dehydration (C) erosion (D) mountains (E) sunlight (F) rainfall (G) sunsets (H) flooding
A:
A