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 the following climates has cold winters and hot summers?  
 (A) polar (B) subtropical (C) temperate (D) tropical
answer:
C


question:
The number of fish in a lake suddenly increases. How will the increase most likely affect the lake?  
 (A) There will be less water in the lake. (B) More plants will grow in the lake. (C) More frogs will live in the lake. (D) There will be fewer insects in the lake.
answer:
D


question:
Plants and animals are composed of organic compounds. Which of the following are the common elements found in organic compounds?  
 (A) iron, oxygen, nickel, copper. (B) sodium, potassium, gold, hydrogen. (C) helium, neon, argon, krypton. (D) carbon, hydrogen, oxygen, nitrogen.
answer:

D