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: Surgery
[{'content': 'Low bih weight statistics of a hospital is best shown by : \nSelect and explain. \nA. Bar chas, B. Histogram, C. Pictogram, D. Frequency polygon', 'role': 'user'}, {'content': 'Answer: B \nExplanation: histogram', 'role': 'assistant'}]