This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Diabetes Mellitus, Subject name: Medicine
[{'content': 'A diabetic patient with autonomic neuropathy presents with dizziness, hypotension during early morning when waking from bed. Drug of choice for this condition? \nSelect and explain. \nA. Dopamine / Dobutamine, B. Isoproterenol, C. Clonidine, D. Midodrine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: DOC for Postural hypeension SBP decrease > 20 mmHg DBP decrease >10 mmHg On Supine - Standing 3 minutes [?]1 agonist MOA - VC Clonidine - (a2 agonist) Isoproterenol - nonselective b- adrenoreceptor Isoproterenol - nonselective b- adrenoreceptor Dobutamine - b1 adrenoreceptor', 'role': 'assistant'}]