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
Unna boot is used for treatment of 
Select and explain. 
A. Diabetic foot ulcer, B. Varicose ulcers, C. Ankle instability, D. Calcaneum fracture
B: Varicose ulcers
Answer: B: Varicose ulcers 
Explanation: Answer- B. Varicose ulcersIt is named for the dermatologist Paul Gerson Unna.This boot can be used to treat uninfected nonnecrotic leg and foot ulcers that result from such conditions as venous insuftciency (varicose ulcers) and stasis dermatitis.