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.

Example Input: Which question about tulips could best be answered by scientific research?
(A) Are tulips better than other flowers? (B) What genes determine tulip petal color? (C) Why do people like to look at tulips? (D) Which color of tulips is the prettiest?
Example Output: B

Example Input: Laura adds 50 mL of boiling water to 100 mL of ice water. If the 150 mL of water is then put into a freezer, at what temperature will the water freeze?
(A) 0C (B) 15C (C) 37C (D) 50C
Example Output: A

Example Input: In a car accident, a seat belt helps prevent injuries by applying a force
(A) less than the force of the moving passenger (B) greater than the force of the moving car (C) in the same direction as the car's motion (D) in the opposite direction of the passenger's motion
Example Output:
D