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
Filariasis involves 
Select and explain. 
A. Only superficial lymphatics, B. Only deep lymphatics, C. Both superficial and deep lymphatics, D. Only skin
A: Only superficial lymphatics
Answer: A: Only superficial lymphatics 
Explanation: Filariasis involves only superficial lymphatics, and is confined to skin and subcutaneous tissue.