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
Greatest amount of cranial growth occurs by: 
Select and explain. 
A. Birth to five years, B. 5 — 6 years, C. 6 — 7 years, D. 7 — 10 years
A: Birth to five years
Answer: A: Birth to five years 
Explanation: The head of a newborn is about 55%–60% of adult head breadth, 40%–50% of adult height and 30%–35% of adult depth. The cranium to-face ratio in a newborn is 8:1.  With continued development, especially of the lower face, the ratio changes to 1:2 in adulthood.
By the age of 8 years, the brain is nearly 95% of its adult size. This rapid growth spurt is followed by a plateau phase of slow but steady growth that continues till adulthood.