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': "A 35 year old lady complains dysphagia, Raynaud's phenomenon, sclerodactyly. Investigations show antinuclear antibody. The likely diagnosis is - \nSelect and explain. \nA. Systemic lupus erythematosis, B. Systemic sclerosis, C. Mixed connective tissue disorder, D. Rheumatoid arthritis", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]