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: Radiology
All of the following modalites can be used for in situ ablation of liver secondaries, except: 
Select and explain. 
A. Ultrasonic waves, B. Cryotherapy, C. Alcohol, D. Radiofrequency
C: Alcohol
Answer: C: Alcohol 
Explanation: Ans. Alcohol