This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, 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: - Schick test: intradermal test to demonstrate circulating diphtheria antitoxin. This antitoxin may be present either due to previous infection or immunisation. -this test demonstrate immunity or susceptibility of a person against diphtheria. - positive Schick test signifies that the person is susceptible to diphtheria due to absence or lack of adequate amount of circulating antitoxin. Reference: Baveja text book of microbiology, 4th edition, pg no:219,220 <\\p>', 'role': 'assistant'}]