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
During the third week of human embryo development- 
Select and explain. 
A. Neural plate formed by stimulation from notochord, B. Amniotic disc forms, C. Body stalk moves ventrally to form umbilical cord, D. Primitive streak formation
D: Primitive streak formation
Answer: D: Primitive streak formation 
Explanation: None