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
Spleen is derived from ? 
Select and explain. 
A. Ventral mesogastrium, B. Dorsal mesogastrium, C. Septum transversorium, D. Allantois
B: Dorsal mesogastrium
Answer: B: Dorsal mesogastrium 
Explanation: Dorsal mesogastrium