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: Unknown
Carcinoma of vulva is: 
Select and explain. 
A. Columnar cell carcinoma, B. Transitional cell carcinoma, C. Adenocarcinoma, D. Squamous cell carcinoma
D: Squamous cell carcinoma
Answer: D: Squamous cell carcinoma 
Explanation: Squamous cell carcinoma is the most frequent form of cancer of the vulva. Malignant melanoma should be reported separately. Histopathologic types are:

Vulvar intraepithelial neoplasia, Grade III, squamous cell carcinoma in situ
Squamous cell carcinoma
Verrucous carcinoma
Paget's disease of vulva
Adenocarcinoma, not otherwise specified (NOS)
Basal cell carcinoma, NOS

Bartholin gland carcinoma