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").

Example Input: Fact1: wind and rain cause erosion, Fact2: Water, in the form of rain, is the most effective agent of erosion., Question: What causes erosion the most? (A) streams (B) motion (C) LEDs (D) water (E) Roads (F) rivers (G) Winter (H) wind
Example Output: D

Example Input: Fact1: Infancy is the period of most rapid growth after birth., Fact2: Development means to get better, growth means to get bigger., Question: What is the period of most rapidly getting bigger after birth? (A) 86400 (B) infancy (C) adult (D) a hosta (E) pregnancy (F) adulthood (G) eight (H) angiosperm
Example Output: B

Example Input: Fact1: breathing is when a gill converts from oxygen in water into oxygen in blood, Fact2: Sharks breathe using gills., Question: What do sharks use to convert oxygen? (A) gills (B) skin (C) blood (D) fins (E) Enzymes (F) mouth (G) tail (H) fibers
Example Output:
A