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': 'Characteristics of blood flow in capillaries \nSelect and explain. \nA. High velocity high stress, B. High velocity low stress, C. Low velocity and pulsatile, D. Low velocity and high shear stress', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]