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: Skin
Depigmenting agent of choice in in treatment of dermatological disorders is 
Select and explain. 
A. Hydroquinone, B. Zinc, C. Kojic acid, D. Azelaic acid
A: Hydroquinone
Answer: A: Hydroquinone 
Explanation: Ans. is 'a' i.e., Hydroquinone Skin depigmenting agents in clinical use are Hydroquinone - most effective and widely used Kojic acid Kojicdipalmitate Azelaic acid