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: Medicine
[{'content': 'Which of the following factors determines whether a patient develops acromegaly or gigantism? \nSelect and explain. \nA. Sex, B. Age at onset of the tumor, C. Amount of available calcium, D. Degree of function of the tumor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]