<prompt> Which of the following may present with isolated prolongation of prothrombin time PT:Factor VIII deficiencyFactor VII deficiencyFactor XII deficiencyFactor IX deficiency  <response>: Answer is B Factor VII deficiency Factor VII deficiency may present with isolated prolongation of prothrombin time. Deficiency of factor VIII, IX and XII may present with isolated prolongation of Paial Thromboplastin Time APTT and not isolated prolongation of prothrombin time PT Cause of Isolated prolongation of PT CMDT Vitamin K deficiency Warfarin therapy Liver disease Factor VII deficiency 