This study is about testing a medicine called **guselkumab** for people in India with a type of arthritis called *Psoriatic Arthritis* (PsA). PsA is a long-lasting disease where the immune system attacks the body, causing joints to swell and hurt. The study will check if guselkumab is safe and effective for those who didn't get better with regular treatments.

• The study involves getting injections under the skin (subcutaneously).
• Participants need to have an active form of PsA and should have not responded well to usual treatments.
• Eligible participants must be free from tuberculosis (TB) and stable in their health conditions.

Before joining, participants will be checked to see if they have PsA and ensure they do not have TB. Women in the study need a special pregnancy test to be negative. People who have had certain infections or cancers, or who are allergic to guselkumab, cannot join. This study helps find better ways to manage PsA for those who need new treatment options.