This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Hypo Pigmentary Disorders, Subject name: Dental
A female has hypopigmented lesion on centre of forehead. The drug responsible is? 
Select and explain. 
A. Hydroquinone, B. Monobenzyl ether of hydroquinone, C. Para teiary butyl catechol, D. Para teiary butyl phenol
D: Para teiary butyl phenol
Answer: D: Para teiary butyl phenol 
Explanation: It is because of allergic reaction to the glue (Para teiary butyl phenol) present in bindi , so commonly seen in female. Contact leucoderma: Monobenzyl ether of hydroquinone is present in rubber, is most potent depigmentary agent. Para teiary butyl catechol is present in hair dye. Para teiary butyl phenol is present in bindi