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
[{'content': 'Quellung reaction is associated with - \nSelect and explain. \nA. Capsular degeneration, B. Capsular delineation, C. Capsular absence, D. Lecithinase production', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Capsular delineation A suspension of pneumococci is mixed on a slide with a drop of the type specific antiserum and methylene blue. On the presence of homologous antiserum capsule becomes apparently swollen, sharply delineated and refractile.", 'role': 'assistant'}]