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: Dental
The schematic diagram shows appropriate pulp tissue zones following formocresol therapy, except 
Select and explain. 
A. Stainless steel crown, B. ZOE buildup, C. Fixation zone, D. Vital Tissue
D: Vital Tissue
Answer: D: Vital Tissue 
Explanation: None