This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Health education & planning, Subject name: Social & Preventive Medicine
[{'content': 'The most comprehensive indicator of cost-effective analysis is \nSelect and explain. \nA. Number of life years gained, B. Number of hea attacks avoided, C. QALYS gained, D. Cost per life year gained', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cost-benefit analysis, in which benefits are compared to cost of the program. The benefits are expressed in monetary termsA cost-effective analysis is similar to cost-benefit analysis except benefits are expressed in terms of results achievedThe most commonly used outcome measure is quality-adjusted life years (QALY)Park 23e pg:871', 'role': 'assistant'}]