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 organ is made mostly of muscle?  
 (A) heart (B) lung (C) ear (D) brain

Ex Output:
A


Ex Input:
How is xylem similar to phloem in a plant?  
 (A) They both take in water from the soil. (B) They both transport materials through the plant. (C) They both make sugar in the leaves. (D) They both store waste products in the plant cells.

Ex Output:
B


Ex Input:
The number of squirrels in a certain ecosystem changes over time. These changes can be represented as a number of connected data points. Which method would a student most likely use to show this information?  
 (A) pie chart (B) line graph (C) pictogram (D) data table

Ex Output:

B