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: Pathology
[{'content': "Raynaud's phenomenon is seen in: \nSelect and explain. \nA. Scleroderma., B. Lupus erythmatosus., C. Both., D. None.", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]