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': 'Find the value of range for the following data 7, 9, 6,8, 11, 10, 4 - \nSelect and explain. \nA. 5, B. 6, C. 7, D. 8', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]