This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'STEPS is the WHO recommended tool for - \nSelect and explain. \nA. Surveillance of non-communicable disease and their risk factors, B. Surveillance of communicable diseases and their risk factors, C. Surveillance of socio-economic status of the community, D. Changes of trends of moality in non-communicable diseases', 'role': 'user'}, {'content': "Answer: A \nExplanation: Park's textbook of preventive and social medicine 23rd edition The STEPS - the non communicable disease risk factors survey to help countries establish CMS surveillance system. It describes 3 steps: questionnaire, physical measurements and biochemical measurements. .", 'role': 'assistant'}]