This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Most essential medicines are formulated as \nSelect and explain. \nA. No compound, B. Single compound, C. Multiple compound, D. Fixed dose combination', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Essential medicines are those that satisfy the priority health care needs of the population. Criteria for selection of essential medicines Essential medicines are selected with due regard to disease prevalence and public health relevance, evidence of clinical efficacy and safety, and comparative costs and cost-effectiveness. Refer 7/e p24', 'role': 'assistant'}]