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.

Input: Consider Input: Which statement is an opinion about the element copper?  
 (A) Copper is a good conductor of electricity. (B) Copper mixed with silver is expensive. (C) Copper can be pounded into many shapes. (D) Copper is an excellent conductor of heat.

Output: B


Input: Consider 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.

Output: C


Input: Consider Input: Which question about tulips could best be answered by scientific research?  
 (A) Are tulips better than other flowers? (B) What genes determine tulip petal color? (C) Why do people like to look at tulips? (D) Which color of tulips is the prettiest?


Output: B