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 of these is a renewable resource found in Nevada?  
 (A) zinc metal (B) gravel deposits (C) petroleum products (D) geothermal energy

Ex Output:
D


Ex Input:
Which unit is used to indicate the amount of energy in food?  
 (A) ounce (B) degree (C) calorie (D) gram

Ex Output:
C


Ex Input:
Which type of tissue functions to move the bones?  
 (A) skin (B) blood (C) muscle (D) brain

Ex Output:

C