Final answer:
(C) Phototherapy is the treatment used for conditions like acne, psoriasis, pressure sores, and wound infections, utilizing specific wavelengths of light to reduce inflammation, slow cell growth, and kill bacteria.
Step-by-step explanation:
The therapy used in the treatment of acne, psoriasis, pressure sores, and wound infections is Phototherapy. Unlike chemotherapy and radiation therapy, which are primarily used for cancer treatment and work by killing rapidly dividing cells, phototherapy involves exposure to specific wavelengths of light.
This treatment can target specific skin conditions, and it is effective in reducing inflammation, slowing abnormal cell growth, and killing bacteria on the skin. Phototherapy can be used for various dermatological conditions and is not intended for treating cancer or psychiatric disorders like electroconvulsive therapy is.