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': 'Dentist act was introduced on \nSelect and explain. \nA. 27th March 1948, B. 29th March 1948, C. 27th March 1949, D. 29th March 1949', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]