You are given a science question (easy-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:
Which disease is a result of abnormal cell division?  
 (A) AIDS (B) cancer (C) chicken pox (D) common cold

Ex Output:
B


Ex Input:
The Sun is classified as  
 (A) an organism (B) a decomposer (C) a star (D) a planet

Ex Output:
C


Ex Input:
An astronomical unit (AU) refers to the distance between  
 (A) Earth and the Sun. (B) the Moon and the Sun. (C) Earth and the Moon. (D) the Sun and the nearest star.

Ex Output:

A