The Cardinal Signs of Inflammation Include Pain, Erythema, Heat, Edema

The cardinal signs of inflammation include pain, erythema, heat, edema, and loss of function. Of what significance is knowledge of the presence of the cardinal signs of inflammation in the consideration of the application of therapeutic ultrasound?

A) The presence of the cardinal signs of inflammation is normal and has no significance in the consideration of the application of ultrasound.
B) If all five of the cardinal signs of inflammation are present, it is not prudent to use continuous ultrasound to elicit a thermal response.
C) If all five of the cardinal signs of inflammation are present, it is prudent to use continuous ultrasound to elicit a thermal response.
D) The presence of all five of the cardinal signs of inflammation is an indication for the thermal application of ultrasound.