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: Surgery
Protein content of <4mg/ml is seen in 
Select and explain. 
A. Dentigerous, B. Periapical, C. Keratocyst, D. Periodontal cyst
C: Keratocyst
Answer: C: Keratocyst 
Explanation: None