Chest challenge answer

By Dr Deepu
The Answer is D.
The scenario is of decreased lung complaince that is restrictive lung disease.
In restrictive lung disease, it may be intrathoracic (pulmonary fibrosis) or extrathoracic ( like ALS, myaesthenia gravis). It can be differentiated by DLCO which will be decreased in fibrosis and
normal in extrathoracic causes.