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': 'Addisonian disease is associated with: \nSelect and explain. \nA. Low blood pressure and oral pigmentation, B. Oral sores, C. Thyrotoxicosis, D. Keratosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]