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': 'Cluster testing technique is useful in which of the following conditions? \nSelect and explain. \nA. Sexually Transmitted Diseases, B. Poliomyelitis, C. Measles, D. Smallpox', 'role': 'user'}, {'content': "Answer: A \nExplanation: Explanation: Following methods are used for case detection of STD: * CONTACT TRACING: Contact tracing is the term used for the technique by which the sexual paners of diagnosed patients are identified, located, investigated, and treated. * CLUSTER TESTING: Here the patients are asked name other persons of either sex who move in the same socio-sexual environment. These persons are then screened. Ref: Park's textbook of Preventive and Social Medicine, 21stedition, Page 313", 'role': 'assistant'}]