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': 'Schick test is for - rpt \nSelect and explain. \nA. Susceptibility to diphtheria, B. Susceptibility to tetanus, C. Susceptibility to sacrlet fever, D. Susceptibility to RF', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Schick test: intradermal test to demonstrate circulating diphtheria antitoxin. This antitoxin may be present either due to previous infection or immunisation. -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 absence or lack of adequate amount of circulating antitoxin. negative Schick indicates that the individual is immune to diphtheria. Reference: Baveja textbook of microbiology, 4th edition, pg no:219,220', 'role': 'assistant'}]