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: Forensic Medicine
Closure of spheno-occipital suture occurs at? 
Select and explain. 
A. 16 years, B. 18 years, C. 25 years, D. 30 years
B: 18 years
Answer: B: 18 years 
Explanation: Ans. is 'b' i.e., 18 yearsSpeno-occipital suture marks the spheno-ocipital synchondrosis, i.e., cailaginous joint between basisphenoid and basiocciput.