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: Dental
The first evidence of cartilage getting converted to bone in craniofacial skeleton occur during 
Select and explain. 
A. Fourth Postnatal week, B. Eighth Prenatal week, C. Fourth Prenatal week, D. Eighth Postnatal week
B: Eighth Prenatal week
Answer: B: Eighth Prenatal week 
Explanation: None