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 teacher breaks a bar of pure copper into two different sized pieces. Which is the most likely difference between the two pieces?  
 (A) mass (B) texture (C) boiling point (D) melting point

Ex Output:
A


Ex Input:
Which plant is grown for food?  
 (A) Rice (B) Tobacco (C) Orchid (D) Cotton

Ex Output:
A


Ex Input:
A researcher determines a cell has a flexible cell wall composed of peptidoglycan. This observation narrows possible classifications of the cell to which taxonomic group?  
 (A) archaea (B) bacteria (C) fungi (D) plants

Ex Output:

B