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
Stemmer's sign is 
Select and explain. 
A. Swelling in the foot seen with lymphoedema, B. Loss of normal perimalleolar shape in lymphoedema, C. Subcutaneous fibrosis which makes skin over dorsum of foot not pinchable, D. Pitting Oedema in filariasis
C: Subcutaneous fibrosis which makes skin over dorsum of foot not pinchable
Answer: C: Subcutaneous fibrosis which makes skin over dorsum of foot not pinchable 
Explanation: Skin over the dorsum of foot cannot be pinched because of subcutaneous fibrosis in filariasis = STEMMER'S SIGN.