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': 'Systematic observation and recording of activities of individuals carried out at predetermined or random intervals is known as: \nSelect and explain. \nA. Input output analysis, B. Work sampling, C. Network analysis, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Systematic observation and recording of activities of individuals carried out at predetermined or random intervals is known as work sampling. It provides quantitative measurement of various activities. It helps in standardising methods of performing jobs and determining manpower needs of any organisation. Ref: Park 22nd edition pg: 815.', 'role': 'assistant'}]