This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Pneumococcal vaccine is prepared from ? 
Select and explain. 
A. Cell surface antigen, B. Capsular polysaccharide, C. From exotoxin, D. From M protien
B: Capsular polysaccharide
Answer: B: Capsular polysaccharide 
Explanation: Ans. is 'b' i.e., Capsular polysaccharide