radiation used in treatment of muscle aches

The radiation used in the treatment of muscle aches are

(A) Infrared

(B) Microwave

(c) UV

(D) X- ray

(E) None of the above/More than one of the above.

ANSWER:  (A)  Infrared

Details: Infrared is part of electromagnetic Spectrum having a frequency less than Visible spectrum. UV have frequency more than Visible spectrum.