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 reward or pleasure center is present in \nSelect and explain. \nA. Ventral tegmental area, B. Ventromedial medulla, C. Magnus raphe nucleus, D. Locus coeruleus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]