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 characteristic of frogs is an adaptation to living in water?  
 (A) strong legs (B) webbed feet (C) dull colors (D) moist skin

Ex Output:
B


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

Ex Output:
B


Ex Input:
Which part of a plant takes in water and nutrients from the soil?  
 (A) root (B) stem (C) flower (D) leaf

Ex Output:

A