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: The particles within a substance are in constant motion. The particles in which of these substances have the lowest amount of kinetic energy?  
 (A) the wax of a candle at room temperature (B) the water in a glass of ice water (C) the steam from a cup of coffee (D) the ice cube in a glass of tea
Example Output: D

Example Input: Which phase of the Moon occurs after a waxing gibbous?  
 (A) waning gibbous (B) waxing crescent (C) full moon (D) new moon
Example Output: C

Example Input: A telescope would be used for all the following except  
 (A) to measure the density of Earth's atmosphere. (B) to learn more about stars and planets. (C) to observe the surface of the Moon. (D) to better understand Earth.
Example Output:
A