This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fertilization and Development of Embryo, Subject name: Anatomy
Embryonic period of development is - 
Select and explain. 
A. Upto 16 weeks, B. Upto 12 weeks, C. Upto 10 weeks, D. Upto 8 weeks
D: Upto 8 weeks
Answer: D: Upto 8 weeks 
Explanation: Ans. is 'd' i.e., Upto 8 weeks o The embryonic period of development extends from the 4th to 8th week of gestation and is also called the period of organogenesis.3 phases of development1. Pre-embryo phase (germinal phase) - day 0 to week 32. Embryo phase - weeks 4-83. Foetal phase - weeks 8-38o Pre-embryo phase divided into,1. Ovulation2 Fertilization and implantationStage of bilaminar germ disc (2nd week)Stage of trilaminar germ disc (3rd week)