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:
Which is true about the Sun and Earth?  
 (A) Earth gives light and heat energy to the Sun. (B) Earth gives only heat energy to the Sun. (C) The Sun gives light and heat energy to Earth. (D) The Sun gives only light energy to Earth.

Ex Output:
C


Ex Input:
High-pressure systems stop air from rising into the colder regions of the atmosphere where water can condense. What will most likely result if a high-pressure system remains in an area for a long period of time?  
 (A) fog (B) rain (C) drought (D) tornado

Ex Output:
C


Ex Input:
A student examined diagrams of two different cells. One cell was prokaryotic, and the other cell was eukaryotic. What should the student do to identify a major difference between the diagrams?  
 (A) compare the shapes of the two cells (B) check to see which diagram shows a nucleus (C) check to see which diagram shows cytoplasm (D) compare the number of vacuoles in the two cells

Ex Output:

B