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': 'Histogram is used to describe - \nSelect and explain. \nA. Quantitative data of a group of patients, B. Qualitative data of a group of patients, C. Data collected on nominal scale, D. Data collected on ordinal scale', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Quantitative data of group of patients", 'role': 'assistant'}]