This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
[{'content': "Positive Shick's test indicates that the 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: Schick test: intradermal test to demonstrate circulating diphtheria antitoxin. This antitoxin may be present either due to previous infection or immunization. This test demonstrates the immunity or susceptibility of a person against diphtheria. Positive Schick test signifies that the person is susceptible to diphtheria due to the absence or lack of adequate amount of circulating antitoxin. Reference: Textbook of Microbiology; Baveja; 4th edition; Page no: 219, 220', 'role': 'assistant'}]