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': 'In sebaceous glands accumulation of sebum leads to – \nSelect and explain. \nA. Millia, B. Acne, C. Epidermoid cyst, D. Milliria', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Blockage of Pilosebaceous gland is the main pathogenic factor for Acne vulgaris.', 'role': 'assistant'}]