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

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