The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Shape of the central groove in Mandibular 2nd premolar is   (A) Y shaped   (B) H shaped   (C) U shaped   (D) All of the above
['(D) All of the above <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Y shaped \n (B) H shaped \n (C) U shaped \n (D) All of the above <> possible answers', '  Shape of the central groove in Mandibular 2nd premolar is <> context@']