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: Anatomy
The period of embryo extends 
Select and explain. 
A. From the first week till the eighth week, B. From the period of ovum till the tenth week, C. From oogenesis till the eight week, D. From fertilization till the eighth week
D: From fertilization till the eighth week
Answer: D: From fertilization till the eighth week 
Explanation: None