instruction:
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.
question:
Which of these technologies helps a power company use renewable energy for the production of electricity?  
 (A) hydroelectric power (B) nuclear power plants (C) natural gas generators (D) coal-fired power plants
answer:
A


question:
Some people carry a mutated allele of a particular gene that makes them resistant to HIV infection and AIDS. Which best describes this type of mutation?  
 (A) beneficial (B) asexual (C) harmful (D) unicellular
answer:
A


question:
A forest was cleared for the building of a resort, but before construction began, secondary succession set in. Which of these describes why secondary succession appeared so rapidly?   
 (A) The clearing allowed mosses to grow quickly. (B) Rock weathering occurred for lichens to grow. (C) Exposed substrates allowed microbes to grow. (D) The soil components remained for plants to grow.
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
D


