This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Mrs. Reeta Wardhan, A 50-year old female with rheumatoid arthritis is being considered for infliximab therapy. Which of the following tests should be performed before beginning treatment? \nSelect and explain. \nA. Liver function tests, B. PPD skin test, C. Pulmonary function tests, D. Visual examination', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Infliximab is a monoclonal antibody against TNF-α. It is commonly used to treat moderate to severe rheumatoid arthritis particularly in patients who have failed methotrexate therapy. TNF-α inhibitors can cause serious adverse effects, includ\xading reactivation of latent tuberculosis. All patients being considered for TNF-α inhibitor therapy should have a baseline PPD skin test to screen for latent tuberculosis.', 'role': 'assistant'}]