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: Pediatrics
All of the following are causes of delayed dentition except 
Select and explain. 
A. Rickets, B. Hyperparathyroidism, C. Hypothyroidism, D. Cleidocranial dysplasia
B: Hyperparathyroidism
Answer: B: Hyperparathyroidism 
Explanation: Delayed dentition means there is no eruption of teeth by the age of 13 months of age (mean + 35D).
Causes of delayed dentition:
Rickets
Down syndrome
Hypothyroidism
Hypoparathyroidism
Cleidocranial dysplasia