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:
A brand of fertilizer claims that it contains all the chemicals a plant needs for rapid growth. It may be inferred that the fertilizer includes all these ingredients except  
 (A) potassium. (B) phosphorus. (C) carbohydrates. (D) nitrogen.
answer:
C


question:
Which of these natural disasters are the most unpredictable?  
 (A) earthquakes (B) hurricanes (C) tornados (D) blizzards
answer:
A


question:
How does the skin help the body maintain homeostasis?  
 (A) The skin transports oxygen. (B) The skin digests viruses. (C) The skin sends messages to the brain. (D) The skin stabilizes temperature.
answer:

D