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': 'Filariasis involves \nSelect and explain. \nA. Only superficial lymphatics, B. Only deep lymphatics, C. Both superficial and deep lymphatics, D. Only skin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Filariasis involves only superficial lymphatics, and is confined to skin and subcutaneous tissue.', 'role': 'assistant'}]