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
Ablett classification is used for grading 
Select and explain. 
A. Hidradenitis suppurativa, B. Tetanus, C. Pyogenic abscess, D. Pyogenic granuloma
B: Tetanus
Answer: B: Tetanus 
Explanation: Ablett classification grades severity of tetanus.