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': 'Lymphoedema is due to all except \nSelect and explain. \nA. Lymphatic valvular insufficiency, B. Increased lymphatic contractility, C. Lymphatic obliteration by infection, D. Increased collagen formation in subcutaneous tissue', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Decreased Lymphatic contractility is implicated in pathophysiology of Lymphoedema.', 'role': 'assistant'}]