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 human organ system eliminates liquid and gaseous wastes from the body?  
 (A) circulatory (B) endocrine (C) excretory (D) reproductive

Ex Output:
C


Ex Input:
Which tool is best used to collect information about the weather?  
 (A) ruler (B) stopwatch (C) thermometer (D) collecting net

Ex Output:
C


Ex Input:
Some plant cells are coated in a waxy layer that prevents water loss. This specialization is found in which plant cells?  
 (A) internal stem cells (B) internal root cells (C) cells on the plant surface (D) cells in the plant reproductive system

Ex Output:

C