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
[{'content': 'Topical azelaic acid is used in – \nSelect and explain. \nA. Hyperpigmentary disorders, B. Dermatophyte infections, C. Vitiligo, D. Mixed infections', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Azelaic acid is a depigmenting agent. Other depigmenting agents are hydroquinone, retinoic acid, kozic acid, glycolic acid, monobenzyl ether of hydroquinone.', 'role': 'assistant'}]