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: Pharmacology
[{'content': "L-thyroxine can be given safely in cases of \nSelect and explain. \nA. Hypothyroidism, B. Hyperthyroidism, C. Hashimoto's disease, D. Graves' disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]