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: Physiology
[{'content': 'Which of the following increases turbulence in blood flow \nSelect and explain. \nA. Reynolds number less than 2000, B. Decrease in velocity of blood, C. Decrease in density of blood, D. Increase in diameter of blood vessel', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The flow of blood (Laminar or turbulent) depends on\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Fluid density (S)\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Tube diameter (D)\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 The velocity of the fluid (V)\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 The viscosity of fluid (n)\nThis can be expressed by Reynold’s number (R) = SDV/n\nNormal flow is laminar. But if the velocity crosses a critical limit (Critical velocity) flow becomes turbulent. If R>2000, flow is turbulent.', 'role': 'assistant'}]