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
Cyst showing cholesterol crystals is/are: 
Select and explain. 
A. Branchial cyst., B. Dentigerous cyst., C. Old hydrocele., D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: Cysts showing cholesterol crystals are:

Branchial cyst
Dental cyst
Dentigerous cyst
Cystic Hygroma (not always)
Old hydrocele
Thyroglossal cyst (not always)