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: Pathology
[{'content': 'In ectodermal dysplasia all of the following structures are affected except: \nSelect and explain. \nA. Hair, B. Nails, C. Teeth, D. Salivary glands', 'role': 'user'}, {'content': "Answer: D \nExplanation: (Note:- Option '4' is correct according to shafer 4th edition. Actually all the 4th\xa0options are involved in ectodermal hypoplasia. Hypoplasia of salivary glands with resultant xerostomia is also seen in ectodermal dysplasia.)", 'role': 'assistant'}]