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.

Ex Input:
The Moon lacks weather and climate changes like those on Earth. What causes the lack of weather on the Moon?  
 (A) the lack of water (B) the presence of igneous rock (C) the very thin atmosphere (D) the lack of magnetic poles

Ex Output:
C


Ex Input:
Biologists are studying the white-tailed deer population in Ohio. Which question could the biologists most likely answer?  
 (A) How fast does this deer population grow? (B) What percentage of people enjoy watching deer? (C) Does this deer population like warmer states? (D) Should people raise deer as pets?

Ex Output:
A


Ex Input:
What do the Milky Way Galaxy and other galaxies in the universe have in common?  
 (A) They are similar in shape. (B) They rotate in the same direction. (C) They contain the same number of stars. (D) They have similar elements.

Ex Output:

D