This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anatomy of skin, Subject name: Dental
[{'content': 'Acne vulgaris invloves- \nSelect and explain. \nA. Pilosebaceous gland, B. Sebaceous gland, C. Eccrine gland, D. Apocrine gland', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Acne vulgaris is s disorder of pilosebaceous gland which predominantly affects the peripubeal population and clinically manifest as comedones, papules, nodules, pustules,and cysts and heals with scar. Ref Harrison20th edition pg 1234', 'role': 'assistant'}]