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What is the purpose of a biopsy?

  1. long and slender with a very small internal diameter

  2. any malignant growth or tumor caused by abnormal cell division

  3. taking out and examining living tissue from a living thing

  4. that part of the central nervous system that includes higher nervous centers

The correct answer is: taking out and examining living tissue from a living thing

A biopsy is a medical procedure in which a small sample of living tissue is taken out from a living thing for examination. This is typically done to diagnose or determine the extent of a disease, such as cancer. Option A refers to the definition of a biopsy needle, which is used to perform a biopsy. Option B is a description of a tumor, which may be diagnosed through a biopsy, and option D is a definition of the brain, which is not directly related to the purpose of a biopsy. Therefore, option C is the most accurate and relevant answer.