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:
A rubber band will make a sound when it is  
 (A) vibrated. (B) stretched. (C) cut into pieces. (D) shot across a room.

Ex Output:
A


Ex Input:
Which is an example of an organism that has been selectively bred for a particular genetic trait?  
 (A) cats that eat mice (B) cows that graze on grass (C) pigs that form large herds (D) chickens that lay large eggs

Ex Output:
D


Ex Input:
How is the theory of plate tectonics different from a hypothesis regarding a certain aspect of plate movement?  
 (A) The theory addresses an Earth-science topic. (B) The theory may change if new evidence emerges. (C) The theory explains a number of related observations. (D) The theory can be evaluated by a single-variable experiment.

Ex Output:

C