C’ in C reactive protein stands for –
**Core Concept**
The C-reactive protein (CRP) is an acute-phase protein that increases in response to inflammation. It is named for its ability to precipitate with the C polysaccharide of pneumococci. The "C" in CRP refers to this specific property.
**Why the Correct Answer is Right**
The correct answer is related to the historical discovery and naming of CRP, which was found to react with the C polysaccharide of pneumococci. This reaction was the basis for its name, indicating its role in immune responses, particularly in relation to bacterial infections like pneumococcal pneumonia.
**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because it does not relate to the historical context or the specific reaction that CRP was named for.
**Option B:** Similarly, this option does not align with the naming convention based on the protein's reactivity.
**Option D:** This is also incorrect as it does not correspond to the pneumococcal C polysaccharide reaction that CRP is known for.
**Clinical Pearl / High-Yield Fact**
CRP is a key marker for inflammation and infection, and its levels can be used to monitor disease activity and response to treatment. Remembering the origin of its name can help in understanding its significance in clinical practice.
**Correct Answer: C.**