This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Following is true about C reactive protein - 
Select and explain. 
A. Detected by precipitation with cabohydrate, B. Raised in acute pneumococcal infection, C. It is antibody, D. Detected by agglutination test
B: Raised in acute pneumococcal infection
Answer: B: Raised in acute pneumococcal infection 
Explanation: S. pneumoniae contain a nucleoprotein deep inside the cell and a somatic C antigen. An abnormal beta globulin that precipitates with the somatic C antigen of S. pneumoniae is called CRP. It appears in acute-phase of pneumonia but disappears during convalescence. ref:Textbook of microbiology, Ananthanarayan an, Paniker. Page no.: 222