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 Q]: 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 A]: E

[EX Q]: Fact1: Urine is the liquid waste product of the body that is excreted by the urinary system., Fact2: Mammals excrete urea in the watery form of urine ., Question: What is a waste product of the body that is excreted by the urinary system? (A) potash (B) food (C) CO 2 (D) sugar (E) urea (F) liquid (G) H 2 O (H) sulfur
[EX A]: E

[EX Q]: Fact1: measuring the hardness of minerals requires scratching those materials, Fact2: Another type of damage is a scratch., Question: measuring the hardness of minerals requires doing what to them? (A) Trigonometry (B) cartilage (C) feedback (D) Cladistics (E) osculum (F) damaging (G) surface (H) treatment
[EX A]:
F