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: Medicine
[{'content': 'A 40 year old presenting with dizziness on standing with systolic reduction of BP of 50mm Hg;appropriate treatment -a) Graded compression stockingsb) Salbutamolc) Fludrocortisoned) β-blockers \nSelect and explain. \nA. a, B. bc, C. ac, D. b', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]