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': 'Povey index does not include: \nSelect and explain. \nA. Long and healthy life, B. Knowledge, C. Income, D. Standards of living', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Income', 'role': 'assistant'}]