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: Gynaecology & Obstetrics
Most common vaginal carcinoma is: 
Select and explain. 
A. Squamous cell carcinoma, B. Adenocarcinoma, C. Botroid's tumor, D. Columnar hyperplasia
A: Squamous cell carcinoma
Answer: A: Squamous cell carcinoma 
Explanation: None