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
Which of the following chemical can cause contact leucoderma? 
Select and explain. 
A. PTBP, B. DEC, C. Clofazimine, D. BACA
A: PTBP
Answer: A: PTBP 
Explanation: Para tertiary butyl phenol (PTBP) is a adhesive used in sticker bindhi that can cause contact leucoderma.