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: Pharmacology
Which of the following agents are useful in the medical treatment of variceal bleeding? 
Select and explain. 
A. Octreotide, B. Pantoprazole, C. Somatotropin, D. Dexamethasone
A: Octreotide
Answer: A: Octreotide 
Explanation: None