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
Most impoant mechanism of action of microwave irradiation is? 
Select and explain. 
A. Thermal effect, B. Ionizing effect, C. Stereotactic effect, D. All of the above
A: Thermal effect
Answer: A: Thermal effect 
Explanation: Ans. is'a'i.e., Thermal effect .Ref: cdn.intechopen.com/.../InTech- Prospective -apPlication -of-microwaves-in-medicineThe most impoant mechanism in medical applications of microwaves is the thermal effects of EM field.