This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development period- week 1,2,3,4, Subject name: Anatomy
[{'content': 'The prochordal plate marks the site of the future \nSelect and explain. \nA. Umbilical cord, B. Hea, C. Mouth, D. Anus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The prochordal plate is a circular, midline thickening of hypoblast cells that are firmly attached to the overlying epiblast cells. The plate will eventually develop into a membrane called the Buccopharyngeal membrane at the site of the future mouth.', 'role': 'assistant'}]