<prompt> Verrucuous carcinoma isExtremely well differentiated squamous cell carcinomaPoorly differentiated squamous cell carcinomaAdenosquamous carcinomaAdenocarcinoma  <response>: 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 9e 