This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pathology, Subject name: Pathology
Verrucuous carcinoma is 
Select and explain. 
A. Extremely well differentiated squamous cell carcinoma, B. Poorly differentiated squamous cell carcinoma, C. Adenosquamous carcinoma, D. Adenocarcinoma
A: Extremely well differentiated squamous cell carcinoma
Answer: A: Extremely well differentiated squamous cell carcinoma 
Explanation: Verrucous carcinoma (also known as Ackerman tumor) is an uncommon exophytic low-grade well-differentiated variant of squamous cell carcinoma. This neoplasm typically involves the oral cavity, larynx, genitalia, skin, and esophagus Refer robbins 9/e