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: Orthopaedics
Unna boot is used in treatment of 
Select and explain. 
A. Fracture of ankle joint, B. Calcaneum fracture, C. Varicose ulcer, D. Diabetic foot ulcer
C: Varicose ulcer
Answer: C: Varicose ulcer 
Explanation: None