The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Tooth most frequently requiring RCT is:   (A) Mandibular 1st molar   (B) Maxillary 1st molar   (C) Mandibular 2nd premolar   (D) Maxillary 2nd premolar
['(A) Mandibular 1st molar <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Mandibular 1st molar \n (B) Maxillary 1st molar \n (C) Mandibular 2nd premolar \n (D) Maxillary 2nd premolar <> possible answers', '  Tooth most frequently requiring RCT is: <> context@']