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: Surgery
Which of the following would you consider ohostatic hypotension? 
Select and explain. 
A. SBP fall by 20 mm hg, DBP fall by 10 mm hg within 3 minutes, B. SBP fall by 20 mm hg, DBP fall by 10 mm Hg within 6 minutes, C. SBP fall by 30 mm hg, DBP fall by 20 mm Hg within 3 minutes, D. SBP fall by 30 mm hg, DBP fall by 20 mm hg within 6 minutes
A: SBP fall by 20 mm hg, DBP fall by 10 mm hg within 3 minutes
Answer: A: SBP fall by 20 mm hg, DBP fall by 10 mm hg within 3 minutes 
Explanation: Answer- A. SBP fall by 20 mm hg, DBP fall by 10 mm hg within 3 minutesOhostatic hypotension is defined as a decrease in systolic blood pressure of 20 mm Hg or a decrease in diastolic blood pressure of 10 mm Hg within three minutes of standing when compared with blood pressure from the sitting or supine position.