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
Cleft lip is due to the nonfusion of 
Select and explain. 
A. Maxillary process with lateral nasal process, B. Maxillary process with medial nasal process, C. Maxillary process with mandibular process, D. All of the above
B: Maxillary process with medial nasal process
Answer: B: Maxillary process with medial nasal process 
Explanation: Human embryology Tenth edition Inderbier Singh Page no:160 Harelip: when one or both maxillary process do not fuse with the medial nasal process, this gives rise to defect in the upper lip. These may vary in degree and unilateral or bilateral