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
Hyperthyroidism in children is not associated with: 
Select and explain. 
A. Periodontal destruction, B. Precocious eruption of teeth, C. Mandibular retrognathism, D. Osteoporosis
C: Mandibular retrognathism
Answer: C: Mandibular retrognathism 
Explanation: None