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: Some touch receptors sense differences in temperature or pain., Fact2: Touch receptors are a type of mechanoreceptor., Question: some mechanoreceptors sense what in temperature? (A) Energy (B) Energy. (C) hunger (D) pain (E) differences (F) kinetic energy (G) heat energy (H) similarities

Ex Output:
E

Ex Input:
Fact1: when a metal rusts , that metal becomes orange on the surface, Fact2: Iron rusts in the presence of oxygen and water., Question: Exposure to oxygen and water can cause iron to (A) decrease strength (B) melt (C) uncontrollable burning (D) thermal expansion (E) turn orange on the surface (F) vibrate (G) Extremes of temperature (H) levitate

Ex Output:
E

Ex Input:
Fact1: skin is used for protecting the body from harmful substances, Fact2: Eyes and skin are the critical organs., Question: What are used for protecting the body from harmful substances? (A) critical organs (B) body critics (C) fur and fat (D) protective bony armor (E) redundant organs (F) layers of fat (G) sea urchins (H) solar waves

Ex Output:
A