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
Diaphragm develops from all except : 
Select and explain. 
A. Septum transervsum, B. Dorsal merocaldium, C. Pleuro - peritoneal membrane, D. Cervical myotomes
B: Dorsal merocaldium
Answer: B: Dorsal merocaldium 
Explanation: Dorsal merocaardium - forms transverse sinus.
Muscular ingrowth from body wall is contributed by cervical somiks C3 - C5.