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': 'Intracytoplasmic Nissl granules are found in? \nSelect and explain. \nA. Perikaryon of neuron, B. Smooth muscle, C. Skeletal muscle, D. Cardiac muscle', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nissl granules are rough endoplasmic reticulum found in dendrites, but absent in axon or axon hillock. They help in protein synthesis.', 'role': 'assistant'}]