This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical Illness Complicating Pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'Itching during cholestasis of pregnancy is due retained : \nSelect and explain. \nA. Bilirubin, B. Bile acids, C. Alkaline phosphatase, D. Bile salts', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Intrahepatic cholestasis and pruritus gravidarum Results from retained bile salts. Linked to high circulating levels of estrogen, which inhibit intraductal transpo of bile acids. Rx - Ursodeoxycholic acid', 'role': 'assistant'}]