This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': "'Obstruction of Inferior vena cava' presents - \nSelect and explain. \nA. Paraumbilical dilatation, B. Thoracoepigastric dilatation, C. Oesophageal varices, D. Haemorrhoids", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Obstruction of inferior vena cava presents as thoracoepigastric dilatation because the vessels involved are the superficial veins, namely, superficial epigastric, lateral thoracic, thoracoepigastric.', 'role': 'assistant'}]