<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 45-year-old woman presents with a complaint of pain in the metacarpophalangeal joints and proximal interphalangeal joints bilaterally. Serology showed positive anti-CCP antibodies. She has been prescribed infliximab for control of her condition. Which of the following needs to be tested before starting treatment in this patient?? A: Uric acid levels, B: PPD skin test, C: Complete blood counts, D: G6PD levels, E: Ophthalmic examination,  <response>: This patient has symptoms and serology consistent with rheumatoid arthritis. She has been prescribed infliximab, which is a TNF inhibitor used to treat autoimmune diseases like rheumatoid arthritis. Before starting treatment with infliximab, it is important to screen for latent TB infection, as TNF inhibitors increase the risk of developing active TB. PPD skin testing should be performed to check for latent TB. Complete blood counts and ophthalmic exams are not directly relevant to screening for TB prior to starting infliximab. G6PD levels are checked before certain antimalarial medications, but not before infliximab. Uric acid levels may be checked in gout, but are not relevant here.B: PPD skin test 