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: Dental
[{'content': 'The ideal data for stratified sampling: \nSelect and explain. \nA. Heterogenous data, B. Homogenous data, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Stratified Random Sampling\n\nThe non-homogenous population is converted to homogenous groups/classes\xa0(strata); sample is drawn from each strata at random, in proportion to its size.\nApplicable for large non-homogeneous population.\nGives a more representative sample than simple random sampling.\nNone of the categories is under or over-represented.\nFor example, In a population of 1000, a sample of 100 is to be drawn for\xa0Hemoglobin estimation; first convert non-homogenous population\xa0to homogenous strata (i.e. 700 males and 300 females), then draw 70 males and\xa030 females randomly respectively.', 'role': 'assistant'}]