This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Thyroid, Subject name: Medicine
[{'content': 'Non pitting edema is seen in? \nSelect and explain. \nA. Congestive cardiac failure, B. Myxedema, C. Liver failure, D. Renal failure', 'role': 'user'}, {'content': 'Answer: B \nExplanation: ANSWER: (B) MyxedemaREF: Harrison\'s 18th ed chapter 36"The edema is non pitting in myxedema because of deposition of hyaluronic acid"Causes of non pitting pedal edema:MyxedemaHyperthyroidism (pretibial myxedema secondary to Graves\' disease),FilarisasisLymphedemaLipoedema', 'role': 'assistant'}]