This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous System, Subject name: Pediatrics
Wide open anterior fontanelle is found in following diseases except: 
Select and explain. 
A. Rickets, B. Cretinism, C. Osteogenesis imperfecta, D. Craniosynostosis
D: Craniosynostosis
Answer: D: Craniosynostosis 
Explanation: d. Craniosynostosis(Ref: Nelson's 20/e p 2817-2819, Ghai 8/e p 41)In Craniosynostosis there is premature fusion of cranial sutures and so fontanelles close early and are small;While, Rickets, Cretinism (Hypothyroidism), Ostoeogenesis imperfecta & Achondroplasia are important causes of large anterior fontanelle.