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: Unknown
[{'content': 'Acne vulgaris primarily involves - \nSelect and explain. \nA. Sweat glands, B. Sebaceous gland, C. Hair follicles, D. Ceruminous glands', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans- B Sebaceous gland Acne vulgaris is a common chronic skin disease involving blockage and/or inflammation of pilosebaceous units (hair follicles and their accompanying sebaceous gland). Acne can present as noninflammatory lesions, inflammatory lesions, or a mixture of both, affecting mostly the face but also the back and chest.', 'role': 'assistant'}]