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:
Carolina uses a microscope to view a soil sample taken from her backyard. Which part of the soil would she ONLY be able to see with a microscope?  
 (A) bacteria (B) grass (C) rainwater (D) rocks

Ex Output:
A


Ex Input:
Animals get energy for growth and repair from  
 (A) soil (B) food (C) water (D) air

Ex Output:
B


Ex Input:
The width of a pencil lead is most accurately measured in  
 (A) meters. (B) inches. (C) millimeters. (D) feet.

Ex Output:

C