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': 'Which technique of instrument grasp is mostly used for tooth preparations employing the lingual approach on anterior teeth? \nSelect and explain. \nA. Modified pen grasp, B. Inverted pen grasp, C. Palm and thumb grasp, D. Modified palm and thumb grasp', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]