This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Concept of health and disease, Subject name: Social & Preventive Medicine
[{'content': 'Optimum unit of preventive, curative and promotive health care is \nSelect and explain. \nA. Appropriateness, B. Availability, C. Adequacy, D. Comprehensiveness', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Health care characteristics include 1) Appropriateness - relevance 2) Comprehensiveness - optimum mix of preventive, curative and promotional services. 3) adequacy 4) availability 5) accessibility 6) affordability 7) feasibility Ref: Park&;s Textbook of Preventive and Social Medicine,24th edition, Page no. 33', 'role': 'assistant'}]