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
[{'content': 'Spleen originates following space of peritoneal cavity: \nSelect and explain. \nA. Dorsal mesentry, B. Ventral mesentry, C. Left subhepatic space, D. Infracolic compament', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Dorsal mesentry', 'role': 'assistant'}]