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
Formation of the Prochordal plate and the Primitive streak is seen at what age of Development? 
Select and explain. 
A. 2 days, B. 8 days, C. 14 days, D. 16 days
C: 14 days
Answer: C: 14 days 
Explanation: Age (in days)Developmental Events2Embryo is at two-cell stage3Morula is formed4Blastocyst is formed8Bilaminar disc is formed14Prochordal plate and primitive streak is seen16Intra-embryonic mesoderm is formed/disc is now three-layeredReference: Inderbir Singh Embryology; 10th edition; Page no: 57