This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
Sclerotherapy failure is defined as 
Select and explain. 
A. Unresponsiveness to consecutive 2 energy sclerotherapies, B. Unresponsiveness to consecutive 3 energy sclerotherapies, C. Remnant bleeding even after sclerotherapy for successive 2 hospital admissions, D. Failure to heal after a single treatment
A: Unresponsiveness to consecutive 2 energy sclerotherapies
Answer: A: Unresponsiveness to consecutive 2 energy sclerotherapies 
Explanation: Failure of endoscopic treatment is declared when two sessions fail to control hemorrhage Ref: Sabiston 20th edition