This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hospital waste and disaster management, Occupational health, Subject name: Social & Preventive Medicine
[{'content': '&;Safety officers&; have to be appointed in factories when no. of workers more than - \nSelect and explain. \nA. 500, B. 1000, C. 2000, D. 5000', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The factories Act, 1948: Health, Safety and Welfare recommendation: A minimum of 500 cubic feet space per worker 1 safety officer per 100 wrokers 1 welfare officer per 500 workers 1 Canteen for greater than 250 workers 1 Creche for greater than 30 women workers Ref: Park 25th edition Pgno: 852', 'role': 'assistant'}]