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: Anatomy
[{'content': 'The receptor cells of the olfactory epithelium are \nSelect and explain. \nA. Bipolar neurons, B. Unipolar neurons, C. Multipolar neurons, D. Stellate cells', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]