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': 'A systematic observation and recording of activities of one or more individuals at random interval is done in – \nSelect and explain. \nA. Systems analysis, B. Network analysis, C. Work sampling, D. Input–Output analysis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Work sampling\n\nIt is systematic observation and recording of activities of one or more individuals, carried out at predetermined or random intervals.\nIt provides quantitative measurement of various activities.\nIt helps in standardizing the methods of performing jobs and determining the manpower needs in any organization.\n\nInput-out analysis\n\nInput → All health service activities which consume resources (manpower, money, material and time).\nOutput → Useful outcomes (cases treated, lives saved).\nInput-output analysis shows how much of each "input" is needed to produce a unit amount of each "output".\n\nSystemic analysis\n\nSystemic analysis is essentially finding the cost-effectiveness of the available alternatives.', 'role': 'assistant'}]