input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Which tooth is known as enigma to endodontist   (A) Mandibular canine   (B) Maxillary 1st premolar   (C) Mandibular 2nd premolar   (D) Mandibular 1st premolar
output: ['(D) Mandibular 1st premolar <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Mandibular canine  (B) Maxillary 1st premolar  (C) Mandibular 2nd premolar  (D) Mandibular 1st premolar <> possible answers', '  Which tooth is known as enigma to endodontist <> context']