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
All of the following modalities can be used for in situ ablation of liver secondaries, except 
Select and explain. 
A. Ultrasonic waves, B. Alcohol, C. Radio frequency, D. Cyrotherapy
A: Ultrasonic waves
Answer: A: Ultrasonic waves 
Explanation: Local (in situ) ablative therapies for liver secondaries Cryotherapy - in situ destruction of tissues by freeze-thaw process. Radio frequency ablation - a probe inseed into the middle of the tumor emits radiofrequency waves from its tip, which heats the surrounding tissue, resulting in coagulative necrosis. Percutaneous ethanol injection Trans catheter chemoembolization Ref : Devita's Cancer: Principles & Practice, 7/e, p 2362