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: Surgery
[{'content': "Rohr's stria found in the placenta are due to: \nSelect and explain. \nA. Deposition of fibrin, B. Blood vessels, C. Langhan's cells accumulation, D. Hofbauer cells accumulation", 'role': 'user'}, {'content': "Answer: A \nExplanation: Deposition of fibrin There may be inconsistent deposition of fibrin called Rohr's stria at the bottom of the intervillous space and surrounding the fastening villa.", 'role': 'assistant'}]