This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': '"Reward pathway" is associated with \nSelect and explain. \nA. Nucleus accumbens, B. Nucleus ambiguous, C. Dentate nucleus, D. Substantia nigra', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Nucleus accumbens# NUCLEUS ACCUMBENS has a significant role in the cognitive processing of motivation, pleasure, and reward and reinforcement learning, and hence has significant role in addiction.', 'role': 'assistant'}]