This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacterial infections, Subject name: Dental
Grenz zone is absent in which type of leprosy 
Select and explain. 
A. TT, B. BT, C. BB, D. LL
A: TT
Answer: A: TT 
Explanation: LEPROSY:- Ref:- Review of Dermatology by Alikhan; pg num:-303