A pаtient аrrives tо the clinicаl with repоrts оf "stomach pain." When asked to point to the area of pain she points to just below the last right intercostal region. You ask her questions concerning the quality of her pain. She states that it comes and goes, occurring mainly at night. Upon palpation she reports pain the right hypochondriac region with a positive Murphy's sign. Which digestive organ may be the source of her pain referral?