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': 'Attention and concentration is mediated by: \nSelect and explain. \nA. Hypothalamus, B. Frontal lobe, C. Parietal lobe, D. Basal ganglia', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. Frontal lobe', 'role': 'assistant'}]