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': 'In chronic obstructive pulmonary disease all are seen EXCEPT - \nSelect and explain. \nA. Low FEV1, B. Increased FEV1 / VC ratio, C. Smoking strongly associated, D. Partially reversible by bronchodilator therapy', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]