input: The following are multiple choice questions (with answers) about medical knowledge.   **Question:** If the pulp of the single rooted canal is triangular in cross-section with the base of the triangle located facially and apex located lingually with the mesial arm longer than the distal, the tooth is most likely:   (A) Max. central incisor   (B) Max. lateral incisor   (C) Mand. second premolar   (D) Mand. central incisor
output: ['(A) Max. central incisor <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Max. central incisor  (B) Max. lateral incisor  (C) Mand. second premolar  (D) Mand. central incisor <> possible answers', '  If the pulp of the single rooted canal is triangular in cross-section with the base of the triangle located facially and apex located lingually with the mesial arm longer than the distal, the tooth is most likely: <> context']