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': "Raynaud's phenomenon is seen in -  a) Scleroderma  b) Reiter 's disease   c) Rheumatoid arthritis   d) Behcet's syndrome  e) Mixed connective tissue disease \nSelect and explain. \nA. ace, B. acd, C. abc, D. cde", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]