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
Where the endoderm and ectoderm approach each other in the head & neck region during the 4th week 
Select and explain. 
A. Pharyngeal Grooves, B. Pharyngeal pouch, C. Pharyngeal membrane, D. Pharyngeal arch
C: Pharyngeal membrane
Answer: C: Pharyngeal membrane 
Explanation: C i.e. Pharyngeal membrane