This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cleft Lip & Palate, Subject name: Surgery
Kernahan Striped Y Classification - The major reference point is. 
Select and explain. 
A. Soft palate, B. Hard palate, C. Incisive foramen, D. Third molar
C: Incisive foramen
Answer: C: Incisive foramen 
Explanation: Ans. (c) Incisive foramenRef: Internet Sources, Syed Nasir Shah, Mariya Khalid, Muhammad Sartaj KhanKernahan proposed this classification in 1971.This system provides graphic classification scheme using Y-configuration as shown in image.* Areas 1 and 4 - Lip (It represents the fusion line between the maxillary prominence and medial nasal prominence at lip level).* Areas 2 and 5 - Alveolus (It represents the fusion line between the maxillary prominence and intermaxillary segment).* Areas 3 and 6 - Primary Palate (It represents the fusion line between the primary and secondary palate and lies anterior to the incisive foramen).* Areas 7 and 8 - Hard palate (It represents the fusion line between palatine shelves of the hard palate posterior to the incisive foramen).* Area 9 - Soft palateThe small circle represents incisive papilla. In order to show the cleft, stippling of the appropriate areas is done on the above diagram.For Examples:* Clefts of the soft palate will be represented by the following diagram* Left Cleft lip will be represented by the following diagram.