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
Chocolate-coloured fluid is seen in the cystic space of 
Select and explain. 
A. Dentigerous cyst, B. Odontogenic keratocyst, C. Unicystic ameloblastoma, D. Papillary cystadenoma tymphomatosum
D: Papillary cystadenoma tymphomatosum
Answer: D: Papillary cystadenoma tymphomatosum 
Explanation: None