You are given a science question (hard-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:
Dr. Tanaka discovered a new virus. The virus has a single strand of a nucleic acid, but she does not know if it is DNA or RNA. After running tests, she concludes that it is DNA. Which of the following would lead her to that conclusion?  
 (A) It contains uracil. (B) It contains adenine. (C) It contains thymine. (D) It contains cytosine.

Ex Output:
C


Ex Input:
Which of the following human traits is least likely to be inherited?  
 (A) height (B) eye color (C) hair color (D) fingerprints

Ex Output:
D


Ex Input:
A carpenter covered a piece of wood with a thin sheet of paper. He struck the covered piece of wood with a hammer. The impact left a small hole in the paper that smelled of smoke. Which kind of energy transfer did this event most likely demonstrate?  
 (A) chemical to thermal (B) mechanical to thermal (C) mechanical to chemical (D) chemical to mechanical

Ex Output:

B