This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oral cavity & Oesophagus, Subject name: ENT
Crypta Magna is the remnant of 
Select and explain. 
A. First Pharyngeal pouch, B. Second Pharyngeal pouch, C. Third pharyngeal pouch, D. Fouh pharyngeal pouch
B: Second Pharyngeal pouch
Answer: B: Second Pharyngeal pouch 
Explanation: Medial surface of each tonsil has 15-20 crypts, the largest of which is called Intratonsillar cleft or crypta Magna (which represents the persistence of the ventral poion of the second pharyngeal pouch)'.Ref: PL Dhingra, Diseases of Ear, Nose & Throat, 7th edition, pg no. 291