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
Teiary chorionic villi develop in which intrauterine week? 
Select and explain. 
A. 3rd week, B. 5th week, C. 7th week, D. 9th week
A: 3rd week
Answer: A: 3rd week 
Explanation: HUMAN EMBRYOLOGY-INDERBIR SINGH tenth edition-page no 93