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 transversum, B. Dorsal mesocardium, C. Pleuroperitoneal membrane, D. Cervical myotomes
B: Dorsal mesocardium
Answer: B: Dorsal mesocardium 
Explanation: B i.e. Dorsal mesocardium Diaphragm develops from septum transversumQ (which forms central tendon of diaphragm), two pleuro-peritoneal membranesQ, dorsal mesentery of oesophagus (i.e. mesoesophagus not mesocardiumQ) and muscular ingrowth from somites at cervical segment 3 to 5 (C3-05) of the lateral body wall (cervical myototnes)QMn - "ST PM DMO and CM = ST Prime Minister, District Medical Officer & Chief Minister"