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: Anatomy
All the following statements about Emphysema are true except 
Select and explain. 
A. Breathlessness is the characteristic presenting symptom, B. Diffusion rate of carbon monoxide is reduced, C. Restrictive pattern on pulmonary function test is seen, D. Long term bronchodilator therapy does not improve lung function
C: Restrictive pattern on pulmonary function test is seen
Answer: C: Restrictive pattern on pulmonary function test is seen 
Explanation: The hallmark of Emphysema is air flow obstruction and pulmonary function test show an obstructive patters Ref Harrison 19th edition pg 306e-4