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 student has just completed a laboratory activity. What is the last action that the student should perform before leaving the lab area?  
 (A) wash hands (B) turn off all equipment (C) put away all glassware (D) wash instruments and table tops

Ex Output:
A


Ex Input:
Most of the United States is a part of which tectonic plate?  
 (A) Pacific Plate (B) Eurasian Plate (C) North American Plate (D) South American Plate

Ex Output:
C


Ex Input:
A body structure under a skunk's tail produces a liquid with a very bad odor. This odor helps the skunk to  
 (A) avoid predators (B) obtain food (C) make a shelter (D) regulate its body heat

Ex Output:

A