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:
An infectious disease causes an increase in the body temperature and a decrease in the blood glucose levels of a deer. What is most likely an effect of this disease?  
 (A) a disruption in the homeostasis of the deer (B) a change in the genetic makeup of the deer (C) an increase in the energy level of the deer (D) an increase in the reproductive rate of the deer

Ex Output:
A


Ex Input:
A duck and turtle are different types of animals. In which way are the duck and the turtle alike?  
 (A) They both hibernate. (B) They both have feathers. (C) They both reproduce by laying eggs. (D) They both provide milk for their young.

Ex Output:
C


Ex Input:
Which factor can increase the amount of sulfur dioxide in the air?  
 (A) applying too much fertilizer to agricultural fields (B) operation of coal-fired electric generating plants (C) a hot summer day (D) too much rain

Ex Output:

B