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.

Input: Consider Input: As water cools to a temperature of zero degrees Celsius and forms ice, water molecules tend to  
 (A) move farther apart. (B) vibrate rapidly. (C) flow more randomly. (D) gradually expand.

Output: A


Input: Consider Input: What are produced in both the male and female reproductive systems in humans?  
 (A) sperm (B) nutrients (C) fertilized eggs (D) sex cells

Output: D


Input: Consider Input: Many scientists theorize that global warming will melt the polar ice caps. What would most likely happen if the polar ice caps melted?  
 (A) Ocean levels would increase. (B) Human population would increase. (C) Vegetation in water would decrease. (D) Global precipitation would decrease.


Output: A