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': 'All are types of cells present in anterior pituitary except: \nSelect and explain. \nA. Somatotropes, B. Isotopes, C. Gonadotropes, D. Thyrotropes', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]