A patient with an inflammatory bowel disorder (Crohn disease) is started on a medication. During the workup of her bowel disease, she was thoroughly worked up and her chest x-ray was normal. After starting therapy with a medication, the patient started to complain of a dry cough. The chest x-ray is shown (See image). Which of the following drug is known to produce the feature see on the chest x-ray?
A. Sulfasalazine
B. Methotrexate
C. Azathoiprine
D. Cyclosporine