The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Most common extraradicular microorganism is/ are:   (A) Actinomyces species.   (B) Propioni bacterium.   (C) Propionicum.   (D) All of the above.
['(D) All of the above. <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Actinomyces species. \n (B) Propioni bacterium. \n (C) Propionicum. \n (D) All of the above. <> possible answers', '  Most common extraradicular microorganism is/ are: <> context@']