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: having food has a positive impact on an organism 's health, Fact2: Birds and animals eat such food ., Question: What generally has a positive impact on an organism's health? (A) stay warm (B) sex with multiple partners (C) smoking (D) exercise (E) nutrients (F) eating (G) Cooking (H) fasting

Ex Output:
F


Ex 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

Ex Output:
E


Ex Input:
Fact1: Ethologists usually study how animals behave in their natural environment., Fact2: Animals behave according to instinct., Question: Ethologists study how animals use what in their natural environment (A) Energy (B) Chlorophyll (C) fur (D) digestion (E) instincts (F) lungs (G) an object (H) Energy.

Ex Output:

E