The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Incidence of 2 canals in mandibular incisors is   (A) 3 - 12%   (B) 12 - 20%   (C) 20 - 41%   (D) Less than 3%
['(C) 20 - 41% <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) 3 - 12% \n (B) 12 - 20% \n (C) 20 - 41% \n (D) Less than 3% <> possible answers', '  Incidence of 2 canals in mandibular incisors is <> context@']