This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Embryonic period is upto 
Select and explain. 
A. 8 weeks, B. 10 weeks, C. 12 weeks, D. 6 weeks
A: 8 weeks
Answer: A: 8 weeks 
Explanation: Embryo refers to the product of conception from the day of feilization to 8 weeks Prenatal period Ovum- 0-2 wks Embryo- 3-8wks Foetus- 9wks - bih Postnatal period Newborn- first 4wks after bih Infant- Bih to 12months Toddler- 1yr to 36 months Preschool child- 37 to 72 months School age child- 73 months to 12yrs Adolescence Early- 10-13 yrs Middle- 14-16 yrs Late- 17-20yrs Ref: Ghai, 9th edition, Chapter 2, Table 2.1