<prompt> Most common type cancer gallbladder in a patient with gallstonesAdenocarcinomasquamous carcinomaAdenosquamous carcinomaLiposarcoma  <response>: The most common cancer in a patient with gallstones is adenocarcinoma90.Occasionally squamous cell carcinoma,adenosquamous or carcinoid tumour can occur. Reference: SRB;s manual of surgery,5th edition, page no.659 