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': 'When a circle is divided into different sectors corresponding to the frequencies of the variable in the distribution, the diagram is known as: \nSelect and explain. \nA. Pie, B. Bar, C. Histogram, D. Pictogram', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pie diagram / charts:\n\nThese are so-called because the entire graph looks like a pie and its components represent slices cut from a pie. The total angle at the centre of a circle is equal to 360° and it represents the total frequency. It is divided into different sectors corresponding to the frequencies of the variables in the distribution.\n\tEg: Distribution of dental disease in 30-40 yr olds.\nThe segments are then shaded with different shades or colors and an index is provided for these shade colors. However, this diagram cannot be used to represent two or more data sets.', 'role': 'assistant'}]