This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lymphoid tissue & Integumentary system, Subject name: Anatomy
[{'content': 'Which of the following statements about hair follicles is true? \nSelect and explain. \nA. They are always associated with an eccrine sweat gland, B. They are present in thin skin but not in thick skin, C. Their associated Arrector pili muscle is composed of striated fibers, D. Their hair shaft inses into the papillary layer of the epidermis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hair follicles are present only in thin skin. They are associated with sebaceous glands and errector pili smooth muscle bundles.', 'role': 'assistant'}]