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:
DNA technology has improved greatly in the last twenty years. Which task has been made easier by the development of DNA technology?  
 (A) identifying genetic disorders (B) determining the parts of an atom (C) observing distant objects in space (D) making very accurate measurements

Ex Output:
A


Ex Input:
Which property of air does a barometer measure?  
 (A) speed (B) pressure (C) humidity (D) temperature

Ex Output:
B


Ex Input:
Different units of measurement are more useful in some settings than in others. Which unit of measurement is most used when comparing distances within the solar system?  
 (A) the mile (B) the kilometer (C) the light year (D) the astronomical unit

Ex Output:

D