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': 'Stainless steel crowns were given by: \nSelect and explain. \nA. Jordon, B. Humphrey, C. Baume, D. Hyatt', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]