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': "Positive Schick's test indicates that person is - \nSelect and explain. \nA. Immune to diphtheria, B. Hypersensitive to diphtheria, C. Susceptible to diphtheria, D. Carrier of diphtheria", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Positive test means that person is susceptible to diphtheria: So immunization is required.\nShick Test\n\nRef: Apurba Sastry’s Essentials of Medical Microbiology 1/e p248, Ananthanarayan 9/e p 241', 'role': 'assistant'}]