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: Mating is generally preceded by courtship., Fact2: For example, a black rooster and a white hen mate, and the resulting offspring are gray., Question: What can result in offspring? (A) seeds (B) competition (C) courtship (D) travel (E) resistance (F) solitude (G) litter (H) reading

Ex Output:
C


Ex Input:
Fact1: Hormones are chemical messengers that control many body functions., Fact2: Growth hormone is in many ways an anti-aging hormone., Question: What controls anti-aging? (A) A computer (B) air (C) chemical messengers (D) ice (E) an electric stove (F) Electrical energy (G) water (H) Chemical energy

Ex Output:
C


Ex Input:
Fact1: Cells have multiple repair mechanisms to fix mutations in DNA., Fact2: DNA DNA is deoxyribonucleic acid., Question: Cells have multiple repair mechanisms to fix mutations in what? (A) Veins and arteries. (B) Most plants (C) the body's largest organ (D) members of their own species (E) wavelengths and photons (F) epidermis and dermis (G) deoxyribonucleic acid (H) peachleaf willow

Ex Output:

G