The following are multiple choice questions (with answers) about medical knowledge.   **Question:** The source of calcium ions of a calcific bridge in a tooth in which calcium hydroxide pulpotomy has been performed is:   (A) Blood vessel borne   (B) Derided cells   (C) Dentin   (D) From the calcium hydroxide
['(A) Blood vessel borne <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Blood vessel borne \n (B) Derided cells \n (C) Dentin \n (D) From the calcium hydroxide <> possible answers', '  The source of calcium ions of a calcific bridge in a\ntooth in which calcium hydroxide pulpotomy has been\nperformed is: <> context@']