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: 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: Gymnosperms are vascular plants that produce seeds in cones., Fact2: Gymnosperms are the plants that are known as evergreens., Question: What are vascular plants that produce seeds in cones? (A) evergreens (B) it needs them (C) Leptospirosis (D) epidermal (E) Conifers (F) white (G) Newton (H) more abundant

Ex Output:
A

Ex Input:
Fact1: harming an animal species causes that animal 's population to decrease, Fact2: Killing snakes is more than unnecessary and harmful to the ecosystem., Question: What can killing snakes cause? (A) Snake population decrease. (B) DNA damage and mutations (C) Snake population variation. (D) death and devastation (E) dead organisms (F) Snake population increase. (G) Destroy crops (H) Snake population stabilization

Ex Output:
A