You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
--------
Question: An animal has six legs. What is it most likely to be?
(A) a spider (B) a fly (C) a lizard (D) a centipede

Answer: B

Question: When gasoline in a car engine is burned, only about 15 percent of the gasoline is converted into mechanical energy. This is because most of the energy in the gasoline is
(A) transformed into heat. (B) stored for use at a later time. (C) changed into chemical energy. (D) used to make the vehicle move.

Answer: A

Question: How does the skin help the body maintain homeostasis?
(A) The skin transports oxygen. (B) The skin digests viruses. (C) The skin sends messages to the brain. (D) The skin stabilizes temperature.

Answer:
D