This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': 'A non symmetrical frequency distribution is known as - \nSelect and explain. \nA. Normal distribution, B. Skewed distribution, C. Cumulative frequency distribution, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]