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: Many consumers feed at more than one trophic level., Fact2: Consumers are heterotrophs that feed on tissues of other organisms., Question: What may eat other organisms at more than one trophic level? (A) barnacles (B) chickens (C) fur seals (D) humans (E) heterotrophs (F) mammals (G) animals (H) rabbit

Ex Output:
E

Ex Input:
Fact1: Sweat wets the skin, and when it evaporates, it cools the body., Fact2: Sweat is released from sweat glands beneath the skin, and as it evaporates, the skin is cooled., Question: What cools the skin? (A) humidity (B) temperature (C) condensation (D) Solar energy (E) evaporation (F) vaporization (G) layers of fat (H) water vapor

Ex Output:
E

Ex Input:
Fact1: an animal requires air for survival, Fact2: It is breathed in by animals and restored to the air by the photosynthesis mechanism of plants., Question: Animals rely on what for survival? (A) proteins (B) glycogen (C) rocks (D) sunlight (E) stars (F) weeds (G) cellulose (H) plants

Ex Output:
H