This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': 'All of the following are features of alveolitis (interstitial lung disease), except - \nSelect and explain. \nA. Exeional dyspnoea, B. Early productive cough, C. Digital clubbing, D. Coarse crepitations during inspiration', 'role': 'user'}, {'content': "Answer: B \nExplanation: Interstitial lung disease is characterised by cough,that is typically dry & distressing,;and breathlessness,that is frequently insidious in inset ,but thereafter relentlessly progressive.Physical examination reveals the presence of inspiratory crackles and in many cases digital clubbing develops.Pulmonary function tests typically show a restrictive ventilatory defect in the presence of small lung volumes and reduced gas transfer. Reference:Davidson's Medicine-22nd edition,page no:706", 'role': 'assistant'}]