What is a biopsy?

A biopsy is a medical procedure involving the excision of a small piece of living tissue for microscopic examination. This method is crucial in diagnosing diseases, particularly cancer, as it allows healthcare professionals to analyze the cellular structure and pathology of the tissue sample. By examining the tissue under a microscope, clinicians can gather vital information about abnormalities, the nature of the disease, and appropriate treatment options.

Other processes, such as tumor removal or blood testing, do not fit the definition of a biopsy, as they involve different procedures and purposes. Imaging tests represent a way to visualize areas inside the body without extracting tissue, further distinguishing them from the invasive nature of a biopsy. Thus, option B accurately encapsulates the essence of what a biopsy entails.