This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': "Nitrates are contraindicated with \nSelect and explain. \nA. Sulphonylureas, B. Immunomodulators, C. SSRI's, D. PDE-5 inhibitors", 'role': 'user'}, {'content': 'Answer: D \nExplanation: Sildenafil & Tadalafil are the PDE-5 inhibitors which are contrainidicated with Nitrates to prevent severe hypotension.', 'role': 'assistant'}]