This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Pharmacology
[{'content': 'Preload of heart reduced by: \nSelect and explain. \nA. CCB, B. Minoxidil, C. Hydralazine, D. Nitroglycerine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d. NitroglycerineRef: Goodman Gilman 13th E/P491Arterial dilators: Decrease afterloadVenodilators: Decrease preloadMixed dilators: Decrease both preload and afterloadCalcium channel blockersNitratesNitroprussideMinoxidil ACE InhibitorsHydralazine ARBsFenoldopam DRIsDiazoxide Alpha blockers', 'role': 'assistant'}]