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: Medicine
Notching of ribs occurs in all EXCEPT 
Select and explain. 
A. Coarctation of aorta, B. Neurofibromatosis, C. Hypothyroidism, D. Osteogenesis imperfecta
C: Hypothyroidism
Answer: C: Hypothyroidism 
Explanation: None