instruction:
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.
question:
What are the products in the reaction shown below? HCl + NaOH ->  
 (A) Na + Cl_{2} (B) NaCL + OH (C) NaOH + Cl (D) NaCl + H_{2}O
answer:
D


question:
The radiant energy that comes to Earth from the Sun is  
 (A) only one wavelength that we see as yellow. (B) a narrow band of wavelengths that is entirely visible light. (C) mostly long wavelengths that become heat energy. (D) a range of many wavelengths from long to very short.
answer:
D


question:
Which of the following is a result of the exchange of homologous chromosome parts during the process of meiosis?  
 (A) random mutations (B) decreased gamete number (C) offspring with unique combinations of traits (D) decreased number of alleles on each chromosome
answer:

C