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
A 42 yrs man presenting with dizziness on standing and SBP falls by 50 mm of g -a) Gradual stockings and compressionsb) SIL isoprenalinec) Fludrocortisoned) Salmeterol 
Select and explain. 
A. a, B. bc, C. ad, D. ac
D: ac
Answer: D: ac 
Explanation: None