This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular System, Subject name: Anatomy
[{'content': 'The cardiac jelly formed around the heart tube during early development, contributes to the formation of: \nSelect and explain. \nA. Pericardium, B. Mesocardium, C. Myocardium, D. Endocardium', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is D. The most appropriate answer to this question is actually endocardial cushion.', 'role': 'assistant'}]