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: a mirror is used for reflecting light, Fact2: Light seems to travel in rays or beams., Question: what can a mirror be used to reflect? (A) noble gases (B) air particles (C) glass (D) focusing a lens (E) rays or beams (F) photons (G) sun's heat (H) an electron lens
Example Output: E

Example Input: Fact1: Differentiation is the process by which unspecialized cells become specialized., Fact2: T helper cells differentiate to Memory cells and effector cells., Question: memory cells and effector cells are what compared to T helper cells (A) dermal & vascular tissue (B) antibodies (C) fetal development (D) antigens (E) occurs over a wide range (F) prokaryotic cells (G) unicellular organisms (H) more specialized
Example Output: H

Example Input: Fact1: Adult worms go through a major transformation to develop reproductive organs., Fact2: An enlarged cummerbund-like band near the worm's head holds the reproductive organs., Question: What grows a cumberbund-like band around itself in adulthood? (A) legumes (B) Bats (C) mammals (D) bamboo (E) swea (F) worms (G) fungi (H) bushes
Example Output:
F