The following are multiple choice questions (with answers) about medical knowledge.   **Question:** According to Kim and colleagues which of the following describe type IV isthmus?   (A) Two canals with a definite connection between them   (B) Complete or incomplete isthmus between three or more canals   (C) Very short, complete Isthmus between two canals   (D) Two or three canal openings without visible connections
['(B) Complete or incomplete isthmus between three or more canals <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Two canals with a definite connection between them \n (B) Complete or incomplete isthmus between three or more canals \n (C) Very short, complete Isthmus between two canals \n (D) Two or three canal openings without visible connections <> possible answers', '  According to Kim and colleagues which of the following describe type IV isthmus? <> context@']