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: Ancestors of hagfish are thought to have been the earliest vertebrates., Fact2: Property of ancestors and forefathers can only be legally inherited by sons., Question: Forefathers of what kind of fish are thought to be the earliest vertebrates? (A) hagfish (B) Pelycosaur (C) fish (D) angiosperm (E) adult (F) Therapsids (G) marine (H) aquatic
Example Output: A

Example Input: Fact1: Molecules of tRNA bring amino acids to the ribosome in the correct sequence., Fact2: Ribosomes are sites of protein synthesis., Question: Molecules of _ initiate protein synthesis (A) Acids (B) nektar (C) sugar (D) tRNA (E) H 2 O (F) three (G) CO 2 (H) HIV
Example Output: D

Example Input: Fact1: HIV infects and destroys helper T cells., Fact2: Helper T Cells Helper T cells are the brains behind immune response., Question: What can HIV infect and destroy part of? (A) water (B) parasitic (C) epidermis and dermis (D) the immune response (E) Veins and arteries. (F) Most plants (G) the body's largest organ (H) Trojan worm
Example Output:
D