This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Special Senses, Subject name: Physiology
[{'content': 'Olfactory receptor cells belong to which group of cells? \nSelect and explain. \nA. Bipolar neurons, B. Fibroblasts, C. Modified epithelial cells, D. Multipolar neurons', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The receptor cells for the smell sensation are bipolar nerve cells derived originally from the central nervous system itself. Olfactory system has the smallest range of intensity discrimination.', 'role': 'assistant'}]