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: What season is the Northern Hemisphere experiencing when it is tilted away from the Sun?  
 (A) spring (B) summer (C) autumn (D) winter

Output: D


Input: Consider Input: Where do good bacteria grow to help keep people healthy?  
 (A) in the brain (B) in the blood (C) on the skin (D) on the bones

Output: C


Input: Consider Input: The speed and general direction of motion of a galaxy relative to the Earth can be determined by  
 (A) measuring its red shift. (B) the gravity it exerts. (C) contrasting it against nearby stars. (D) observing its motion across the sky.


Output: A