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").

Ex Input:
Fact1: Cells are organized into tissues, and tissues form organs., Fact2: Major organs, including the kidneys and liver, begin to grow., Question: what forms the liver? (A) bile (B) alcohol (C) stones (D) animals (E) ovaries (F) cells (G) meat (H) humans

Ex Output:
F

Ex Input:
Fact1: wiring requires an electrical conductor, Fact2: Wires connected to a source of electricity., Question: An electrical conductor is required for the operation of: (A) water current (B) electricity (C) satellites (D) energy (E) to move people (F) gas lamps (G) trains (H) lightning

Ex Output:
B

Ex Input:
Fact1: Population density is the average number of individuals per unit of area or volume., Fact2: Population density varies considerably., Question: the average number of individuals per unit of area or what can vary considerably? (A) Decibels (B) colors (C) dense (D) Summer (E) volume (F) seasons (G) animals (H) decreases

Ex Output:
E