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: Surgery
[{'content': "Vasodilation in spider naevi is due to aEUR' \nSelect and explain. \nA. Hepatotoxin, B. Estrogen, C. Testosterone, D. DHEA", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Estrogen', 'role': 'assistant'}]