<prompt> Which is not required for visualisation of gallbladder in oral cholecystographyFunctioning liverMotor mechanisms of gall bladderPatency of cystic ductAbility to absorb water  <response>: Visualization of the gallbladder in OCG depends on:-Ingestion of dyeAbsorption of dye in gutBlood flow to liver Entero-hepatic-circulationTake up in liver functional liver, ability of liver to excrete dye into the bile functional liverThe ability of gallbladder to concentrate the excreted dye by absorbing waterPatency of hepatic cystic duct system 