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': 'Untoff phenomenon is - \nSelect and explain. \nA. Worsening of symptom with cold, B. Relief of symptom with cold, C. Worsening of symptom with heat and exertion, D. Palsy of symptom with heat and excretion', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]