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
A female has a hypopigmented lesion on the centre of the forehead. Drug responsible is? 
Select and explain. 
A. Hydroquinone, B. Ether metabolite of hydroquinone, C. Para tertiary butyl catechol, D. Para tertiary butylphenol
D: Para tertiary butylphenol
Answer: D: Para tertiary butylphenol 
Explanation: Hypopigmented lesions in the centre of the forehead suggest chemical leucoderma with para tertiary butyl phenol. Which is a component of bindi. (Therefore hypopigmentation is on central head).