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': 'Schick test in diphtheria is done to know: \nSelect and explain. \nA. Carriers, B. Subseceptibles, C. Diseased, D. Immunized', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Subseceptibles', 'role': 'assistant'}]