What does CRP stand for in medical testing?

C-reactive protein is a substance produced by the liver in response to inflammation. It is an important marker used in medical testing to assess various inflammatory conditions and to monitor the response to treatment in diseases such as rheumatoid arthritis, inflammatory bowel disease, and infections. The measurement of CRP levels in the blood can provide critical information about a patient's health status.

The other options do not accurately reflect established terms or measurements in medical testing. While "C-reactive phosphorus" may sound plausible, it is not a recognized term in the context of inflammation or medical diagnostics. "Cyanide-resistant protein" and "Chemical reaction product" do not relate to the inflammatory response or have any relevance to standard clinical tests associated with inflammation. Thus, C-reactive protein is the correct term and is widely recognized in clinical practice.