This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Budd chiari syndrome & Pancreatitis, Subject name: Medicine
[{'content': 'A 25-year-old woman develops nausea, vomiting, and abdominal pain. On examination, she has tender hepatomegaly and ascites. She was recently staed on oral contraceptives. What shall be the clinical diagnosis ? \nSelect and explain. \nA. Budd -Chiari syndrome, B. Acute Viral hepatitis, C. Poal Hypeension, D. Acute cholecystitis', 'role': 'user'}, {'content': "Answer: A \nExplanation: Budd-Chiari syndrome: Thrombus in hepatic veins - sinusoidal pressure | - hepatomegaly - stretching of capsule - RUQ pain Causes: 1. Hematological disorder - Polycythemia vera (JAK 2 mutation) & PNH2. Protein C/S, AT III | - | clotting tendency in body3. High estrogen leads to hypercoagulable state4. Tumors - HCC, RCC, Wilm's tumor (tumor pressing hepatic vein)5. Infections - hydatid cyst6. CTD - Behcet ds, Sarcoidosis, APLAS (Anti b2 glycoprotein)- intrinsic system activation", 'role': 'assistant'}]