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
Which of the following are seen in ectodermal dysplasia? 
Select and explain. 
A. Hyperpyrexia, B. Protuberant lips and frontal bossing, C. Defective or absence of sweat glands, D. Any of the above
D: Any of the above
Answer: D: Any of the above 
Explanation: Hyper pyrexia due to hypohidrosis, hypotrichosis, hypodontia, protuberant lips and depressed nasal and supraorbital bridges are important features of ectodermal dysphasia