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: Dental
[{'content': 'A probable etiology of gingivosis is? \nSelect and explain. \nA. High progesterone levels, B. Deficiency of estrogen and testosterone, C. Pregnancy, D. Aldosterone deficiency', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]