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
Crystalline miliaria is due to obstruction to 
Select and explain. 
A. Sweat gland, B. Sebaceous glands, C. Accessory sweat gland, D. Hair roots
A: Sweat gland
Answer: A: Sweat gland 
Explanation: Miliaria crystallina is caused by obstruction of the sweat ducts close to the surface of the skin Miliaria rubra, caused by obstruction of the sweat ducts deeper in the epidermis; Miliaria profunda, the result of sweat leaking into the middle layer of skin (dermis). Ref Harrison20th edition pg 1207