The following are multiple choice questions (with answers) about medical knowledge.   **Question:** Cholesterol crystals in apical periodontitis lesions are believed to be formed from cholesterol released by:   (A) Disintegrating erythrocytes of stagnant blood vessels within the lesion   (B) Lymphocyte, plasma cells, macrophages that die and disintegrate in chronic apical lesion   (C) Circulating plasma lipids   (D) All of the above
['(D) All of the above <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Disintegrating erythrocytes of stagnant blood vessels within the lesion \n (B) Lymphocyte, plasma cells, macrophages that die and disintegrate in chronic apical lesion \n (C) Circulating plasma lipids \n (D) All of the above <> possible answers', '  Cholesterol crystals in apical periodontitis lesions are believed to be formed from cholesterol released by: <> context@']