This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Growth and development, Subject name: Pediatrics
Which of the following Fontanelle is the last to close: 
Select and explain. 
A. Anterior fontanelle, B. Posterior Fontanelle, C. Anterolateral fonatnelle, D. Posterolateral fontanelle
A: Anterior fontanelle
Answer: A: Anterior fontanelle 
Explanation: The anterior fontanelle is the last to close around the middle of the second year (18 months). The anterior fontanelle is also the most impoant because it is the largest and last to close. Sequence of Fontanelle closure : Posterior fontanelle(Lambdoid) : 2-3 months Anterolateral Fontanelle(Sphenoidal): 6 months Posterolateral Fontanelle (Mastoid): 6-18 months Anterior Fontanelle(Bregmatic): 18 months Reference : Ghai essentials 9th edition Pg no : 10