This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Physiology
A 25-year-old woman develops nausea, vomiting, and abdominal pain. On examination, she has tender hepatomegaly and ascites. She was recently started on oral contraceptives. The clinical diagnosis is? 
Select and explain. 
A. Budd-Chiari syndrome, B. Acute viral hepatitis, C. Portal hypertension, D. Acute cholecystitis
A: Budd-Chiari syndrome
Answer: A: Budd-Chiari syndrome 
Explanation: Ans. A Budd-Chiari syndromeRef: CMDT 2019 page 726Budd-Chiari syndrome occurs from thrombosis of the major hepatic veins and has been associated with oral contraceptives. The main diagnostic features are* Right upper quadrant pain and tenderness* Ascites* Imaging studies show occlusion/absence of flow in the hepatic vein(s) or inferior vena cava* Clinical picture is similar in sinusoidal obstruction syndrome but major hepatic veins are patent.