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': 'Wrench like grip is obtained with \nSelect and explain. \nA. Mesial half crown, B. Three fourth crown, C. Dowel crown, D. Jacket crown', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]