This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nasolacrimal Disorders, Subject name: Ophthalmology
Which tumour is classically described as having a 'swiss cheese' appearance? 
Select and explain. 
A. Rhabdomyosarcoma, B. Benign mixed tumour, C. Adenoid cystic carcinoma, D. Meningioma
C: Adenoid cystic carcinoma
Answer: C: Adenoid cystic carcinoma 
Explanation: Adenoid cystic carcinoma generally presents in young or middle-aged adults with a mean age of 40 years, but can occur in the first decade of life. On histology, the tumor is defined by bland appearing, but malignant epithelial cells clearly delineated from adjacent connective tissue. The tumor can present in several subtypes including cribriform (Swiss cheese), sclerosing, basaloid, comedocarcinoma, and tubular (ductal).