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 tooth but does not cause hypoplasia is: 
Select and explain. 
A. Hypoparathyroidism, B. Hyperthyroidism, C. Rickets, D. Syphilis
B: Hyperthyroidism
Answer: B: Hyperthyroidism 
Explanation: None