<prompt> Most common anal carcinoma is-Basal cell carcinomaSq. cell carcinomaMelanomaAdenoma  <response>: Ans. is b i.e., Sq. cell carcinoma o Mainly 3 types of malignant neoplasm are seen in anal canal:Squamous cell Ca MCBasal cell Ca Ilnd meMelanomaRemember MC type of rectal colon Ca - Adenocarcinoma. 