A patient, who has been taking betamethasone for a long time to treat bronchial asthma, started taking nonsteroidal anti-inflammatory drugs (NSAIDs) without consulting a doctor. After a while, he developed gastric bleeding caused by a stomach ulcer. What drug has most likely caused this complication?

• A. Diclofenac sodium
• B. Paracetamol
• C. Prednisolone
• D. Celecoxib
• E. Drotaverine