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': 'The major determinant for the rate of cerebral blood flow is: \nSelect and explain. \nA. Intracranial pressure, B. Aoic blood pressure, C. Aerial PaCO2, D. Neurogenic regulation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Factors affecting overall cerebral blood flow include: Intracranial pressure Local constriction & dilation of cerebral aerioles Mean aerial pressure at brain level Viscosity of blood Mean venous pressure at brain level', 'role': 'assistant'}]