<prompt> Which is Not required for visualisation of gall bladder in oral cholecystography:Functioning liverMotor mechanisms of gall bladderPatency of cystic ductAbility to absorb water  <response>: B i.e. Motor mechanism of Gall bladdar Oral Cholecystography Graham - Cole - Test OCG was introduced in 1924 by Graham Cole. - NaCa-Iopanoic acid TelepaqueQ Biloptin Solubiloptine dye is used as contrast media. - 3 gmQ of dye is given X Rays are taken at an interval of 12-15 hours. - USG has replaced itQ. 