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 due to - \nSelect and explain. \nA. Capsular swelling, B. Mitochondrial swelling, C. RBC swelling, D. Ribosomal swelling', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Capsular swelling", 'role': 'assistant'}]