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 was taking notes while the teacher was discussing cells. Which of these is a statement that the teacher most likely made?  
 (A) Most cells have the same shape. (B) The shape of a cell depends upon its function. (C) Cells that carry information are round and disk-shaped. (D) Blood cells that move through the body are long and thread-like.

Ex Output:
B


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:
An atom consists of a nucleus surrounded by  
 (A) ions. (B) protons. (C) neutrons. (D) electrons.

Ex Output:

D