This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pathology
[{'content': 'Hairpin shaped eosinophilic structure present in radicular cyst is: \nSelect and explain. \nA. Rushton bodies, B. Russell bodies, C. Both of the above, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Periapical Cyst\xa0\nThe\xa0cyst\xa0lumen\xa0may\xa0be\xa0filled\xa0with\xa0fluid\xa0and\xa0cellular\xa0debris.\xa0On\xa0occasion,\xa0the\xa0lining\xa0epithelium may demonstrate linear or arch-shaped calcifications known as Rushton bodies\xa0\nSquamous epithelial cyst lining exhibiting numerous irregular and curvilinear Rushton bodies.', 'role': 'assistant'}]