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 is a renewable resource found in Nevada?  
 (A) zinc metal (B) gravel deposits (C) petroleum products (D) geothermal energy
answer:
D


question:
Which type of air mass forms over the ocean near the equator?  
 (A) moist and warm (B) moist and cool (C) dry and warm (D) dry and cool
answer:
A


question:
Which is an example of symbiosis?  
 (A) a tick feeding on a deer (B) a lion hunting a zebra (C) a dandelion growing in a grass lawn (D) a dolphin communicating with another dolphin
answer:

A