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: Medicine
[{'content': 'A 42 yrs man presenting with dizziness on standing and SBP falls by 50 mm of Hg \nSelect and explain. \nA. Gradual stockings and compression, B. SIL isoprenaline, C. Fludrocoisone, D. Oral indomethacin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Compression stockings are medical grade devices designed to move blood flow.. Most commonly compression suppo stockings come in mild (8-15 mmHg), Medium (15-20 mmHg), Firm (20-30 mmHg), X-Firm (30-40 mmHg) gradient compression levels. Ref Davidson 23rd edition pg 456', 'role': 'assistant'}]