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': 'Simplest measure of dispersion-a)  Rangeb) Standard deviationc) Mean deviationd) Co-efficeint of range \nSelect and explain. \nA. a, B. ad, C. ac, D. ab', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The range\no Range is the simplest measure of dispersion.\no It is defined as the difference between the largest and smallest values of the variable.\n\xa0\xa0 Range (R) = Largest value (L) - Smallest value (S)', 'role': 'assistant'}]