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': 'Pleurisy is common in which one of the following connective tissue disease - \nSelect and explain. \nA. System lupus erythematosis, B. Systemic sclerosis, C. Polyaritis nodosa, D. Mixed connective tissue disease', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]