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': 'Recurrent aspiration pneumonia caused by \nSelect and explain. \nA. Dermatomyostis/polymyositis, B. Rheumatoid ahritis, C. Progressive systemic sclerosis, D. Systemic lupus erythrematosus', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. Progressive systemic sclerosisEsophageal hypomotility and incompetence of the lower esophageal sphincter disease causes chronic gastroesophageal reflux and recurrent episodes of aspiration in systemic sclerosis.', 'role': 'assistant'}]