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': 'Not true about ergonomics \nSelect and explain. \nA. Designing of machines, B. Improvement of efficiency of both man & machines, C. Related to PHC criterias, D. Adjusting the worker to his job', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]