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: Evaporation of sweat uses energy, and the energy comes from body heat., Fact2: When sweat is evaporated into the air, it provides additional cooling., Question: Energy that comes from body heat can help with  (A) recovery (B) commuting (C) movement (D) cooling (E) strength (F) stay warm (G) health (H) motion
[EX A]: D

[EX Q]: Fact1: Cells are the basic units of the structure and function of living things., Fact2: Tigers are the largest of the living cats., Question: Cells are the basic units of the structure and function of what? (A) water (B) mammals (C) ice (D) tigers (E) animals (F) humans (G) plants (H) the Sun
[EX A]: D

[EX Q]: Fact1: Echinoderms have a unique water vascular system with tube feet., Fact2: Each starfish arm is lined with tube feet., Question: Where does a starfish have its water vascular system? (A) salt and water. (B) Chlorophyll (C) the environment (D) in its arms (E) on the rocks (F) in its eyes (G) Epidermis (H) in the ocean
[EX A]:
D