This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Embryology 1, Subject name: Anatomy
[{'content': 'Connecting Stalk forms \nSelect and explain. \nA. primary umblical cord, B. secondary umblical cord, C. decidua paritalis, D. decidua capsularis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Connecting Stalk forms primary Umbilical Cord .', 'role': 'assistant'}]