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': 'Lisengang rings are present in \nSelect and explain. \nA. CEOT, B. OKC, C. CGCG, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Calcifying Epithelial Odontogenic Tumor (Pindborg tumor) is a rare, benign odontogenic lesion. This is rare benign tumor which was first described in 1955 by Dutch pathologist Or J J Pindborg.', 'role': 'assistant'}]