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:
What force pulls things towards the center of Earth?  
 (A) magnetism (B) gravity (C) friction (D) energy

Ex Output:
B


Ex Input:
Diamonds are sometimes used as the tips of drill bits. Which physical property of a diamond MOST likely makes it a good cutting tool?  
 (A) its electrical properties (B) its thermal properties (C) its hardness (D) its density

Ex Output:
C


Ex Input:
Some runners ate pasta before a race. The pasta was broken down into simple sugars and was absorbed by the blood stream. What body system was responsible for breaking down the pasta into small nutrients for use in the cells of the runners?  
 (A) the nervous system (B) the digestive system (C) the excretory system (D) the endocrine system

Ex Output:

B