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.

Q: The Grand Canyon is an example of  
 (A) erosion. (B) deposition. (C) an earthquake. (D) volcanic activity.

A: A
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Q: Which disease is a result of abnormal cell division?  
 (A) AIDS (B) cancer (C) chicken pox (D) common cold

A: B
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Q: Tissue plasminogen activator is a natural blood thinner. The coded sequence for the blood thinner is called PLAT , found on chromosome 8. It is used to treat people who have heart attacks and strokes. Tissue plasminogen activator can be made through genetic engineering. What is tissue plasminogen activator?  
 (A) a gene (B) a protein (C) a platelet (D) a DNA molecule

A:
B
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