Narrowing of a body opening or passage.

• A. Endoscopy
• B. Stenosis
• C. Infarct
• D. Ischemia

Answer: (B)

Stenosis is the term for narrowing of a body opening or passage, meaning the diameter of a lumen becomes reduced, which can impede flow or passage through that structure. This name is used for various parts of the body, such as blood vessels, the heart valves, or tubular organs. Because the question is asking for a term that describes a narrowing, stenosis is the best fit.

Endoscopy describes a procedure to visualize internal organs, not a description of narrowing. Infarct refers to tissue death from a lack of blood flow, and ischemia means reduced blood supply to tissue—both are related to blood flow, not to the actual narrowing of a passage.