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: Dental
Premaxilla is derived from 
Select and explain. 
A. Maxillary protuberance, B. Palatine bones, C. Frontonasal process, D. Median process
C: Frontonasal process
Answer: C: Frontonasal process 
Explanation: None