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 is a common use of the mineral graphite?  
 (A) to make glass (B) as a source of iron (C) to make pencil leads (D) as a household cleaner

Output: C


Input: Consider Input: Which animal eats only plants?  
 (A) Cat (B) Dog (C) Lion (D) Rabbit

Output: D


Input: Consider Input: In order to survive, all organisms must have  
 (A) chlorophyll (B) carbon dioxide (C) energy (D) blood


Output: C