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: Social & Preventive Medicine
[{'content': "Positive schick's test indicates that the person is - \nSelect and explain. \nA. Immune to diphtheria, B. Hypersensitive to diphtheria, C. Susceptible to diphtheria, D. Susceptible and hypersensitive to diphtheria", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]