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': 'GER increases if - \nSelect and explain. \nA. Efferent aeriole constricts, B. Efferent aeriole dilates, C. Afferent aeriole constricts, D. Afferent aeriole dilates', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e., Afferent aeriole dilates', 'role': 'assistant'}]