You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is In ectodermal dysplasia all of the following structures are affected except: and explain in detail?
(Note:- Option '4' is correct according to shafer 4th edition. Actually all the 4th options are involved in ectodermal hypoplasia. Hypoplasia of salivary glands with resultant xerostomia is also seen in ectodermal dysplasia.)