<prompt> A patient undergoes surgery in pelvic region. Which vein is most likely to result in thrombosis?Iliac veinFemoral veinCalf veinIVC  <response>: Risk factors for DVT Acquired: Obesity Infection Prolonged immobilization in surgery of lower limb or pelvic region MC site of DVT - Calf vein or soleal vein MC site of DVT leading to PE - Thigh vein or Femoropopliteal vein 