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.

Input: Consider Input: Which scientist is credited with using a telescope in the seventeenth century to discover the moons of Jupiter?  
 (A) Galileo (B) Kepler (C) Einstein (D) Newton

Output: A


Input: Consider Input: Auroras occur where Earth's magnetosphere traps high-energy particles in which region of the atmosphere?  
 (A) troposphere (B) stratosphere (C) thermosphere (D) exosphere

Output: C


Input: Consider Input: Which is the best description of the brightness of the Sun?  
 (A) It is less bright than planets. (B) It is brighter than other stars. (C) It is of average brightness compared to planets. (D) It is of average brightness compared to other stars.


Output: D