The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The advantage of ultra speed hand piece is:   (A) Low frequency and high amplitude make the patient comfortable   (B) High frequency and low amplitude do not let the patient perceive pain   (C) Less trauma   (D) None of the above
['(B) High frequency and low amplitude do not let the patient perceive pain <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Low frequency and high amplitude make the patient comfortable \n (B) High frequency and low amplitude do not let the patient perceive pain \n (C) Less trauma \n (D) None of the above <> possible answers', '  The advantage of ultra speed hand piece is: <> context@']