<prompt> Commonest type of carcinoma with gallstones isAdenocarcinomaAnaplastic carcinomaSquamous cell carcinomaTransitional cell carcinoma  <response>: Histological types of gallbladder carcinoma Diffuse infiltrative : MC type Nodular or mass forming Papillary : Exhibits polypoid or cauliflower appearance and have best prognosis Adenocarcinoma : MC histological subtype of CA GB associated with gallstones Ref: Sabiston 20th edition Pgno : 1512-1514 