Final answer:
Psoriasis commonly appears on the scalp, elbows, knees, chest, and lower back. It involves itchy patches of red skin with silvery scales caused by rapid cell turnover.
Step-by-step explanation:
Psoriasis commonly manifests in various areas of the body. The correct answer is B) Scalp, elbows, knees, chest, and lower back. Psoriasis is a skin disease characterized by itchy or sore patches of thick, red skin with silvery scales. These patches often appear on the elbows, knees, scalp, as well as the chest and lower back. The condition may also affect other areas, including the face, palms, and feet. In some cases, psoriasis can lead to psoriatic arthritis, causing joint inflammation. The rapid cell turnover due to cytokine activation is responsible for the development of the thick inflamed patches characteristic of psoriasis.