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 patient presents with tachycardia, BP<100mm Hg systolic and postural hypotension. Diagnosis is - 
Select and explain. 
A. Vasovagal attack, B. Diabetic neuropathy, C. Shy drager syndrome, D. Bleeding peptic ulcer
D: Bleeding peptic ulcer
Answer: D: Bleeding peptic ulcer 
Explanation: None