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:
The greatest amount of diversity can be found among which type of organism?  
 (A) plants (B) animals (C) bacteria (D) fungi

Ex Output:
C


Ex Input:
A scientist uses angstrom units to measure the distance between two points. The scientist is most likely measuring the distance between two  
 (A) atoms. (B) cities. (C) continents. (D) stars.

Ex Output:
A


Ex Input:
Most stars in the Milky Way are like the Sun. The Sun will eventually become a red giant. After the red giant stage, what determines whether a star will become a white dwarf or a supernova?  
 (A) the mass of the star (B) the diameter of the star (C) the brightness of the star (D) the type of gas in the star

Ex Output:

A