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': "Kuppuswami's classification of socio economic status is based on all of the following indices, EXCEPT: \nSelect and explain. \nA. Income, B. Occupation, C. Education, D. House type", 'role': 'user'}, {'content': "Answer: D \nExplanation: Kuppuswamy's classification is an index for estimation of socio-economic status. The 3 variables used in this classification to assess socio economic status are education, occupation and income. House type is not considered in this classification. Ref: Parks Textbook of Preventive and Social Medicine 20th edition page 602.", 'role': 'assistant'}]