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:
A tropical rain forest contains many tall trees. Smaller plants with large leaves grow at the base of the tall trees. The large leaves are most likely an adaptation of the plant due to which condition?  
 (A) lack of sunlight (B) lack of oxygen (C) lack of water (D) lack of food

Ex Output:
A


Ex Input:
What do the tinted lenses of sunglasses do to the UV rays of the Sun?  
 (A) absorb (B) deflect (C) reflect (D) refract

Ex Output:
C


Ex Input:
All galaxies in the universe  
 (A) are composed of many stars. (B) have a clockwise spin. (C) are irregularly shaped. (D) have the same number of stars.

Ex Output:

A