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
A disease which only affects the formation and eruption of the tooth but does not cause  
hypoplasia is? 
Select and explain. 
A. Hyperthyroidism, B. Hypothyroidism, C. Vitamin A deficiency, D. All of the above
A: Hyperthyroidism
Answer: A: Hyperthyroidism 
Explanation: Hyperthyroidism does not cause hypoplasia.
In children, shedding of the deciduous teeth occurs earlier than normal, and eruption of the permanent teeth is greatly accelerated.
Ref: Shafer's textbook of oral pathology 7th edition page 652