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: Any antigen that causes an allergy is called an allergen., Fact2: Asthma attacks are caused by allergies., Question: Asthma attacks can be triggered by (A) allergens (B) hormones (C) bad weather (D) Lymphocytes (E) rifles (F) wheezing (G) night sweats (H) estrogen
Output:
A