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 Q]: What is the function of the nucleus in a cell?  
 (A) provides energy (B) provides nutrients (C) controls activity (D) controls movement
[EX A]: C

[EX Q]: The nucleus of MOST atoms consists of  
 (A) neutrons only (B) protons and neutrons (C) protons and electrons (D) neutrons and electrons
[EX A]: B

[EX Q]: How are droughts always different from floods?  
 (A) They have different locations. (B) They happen in different ecosystems. (C) They have different amounts of water. (D) They happen at different times of the year.
[EX A]:
C