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
Acne vulgaris primarily involves - 
Select and explain. 
A. Sweat glands, B. Sebaceous gland, C. Hair follicles, D. Ceruminous glands
B: Sebaceous gland
Answer: B: Sebaceous gland 
Explanation: 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.