This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immune system, Subject name: Medicine
[{'content': 'Kveim test is used for- \nSelect and explain. \nA. Tuberculosis, B. Systemic lupus erythematosis tissue, C. Sarcoidosis, D. Cystic fibrosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The Kveim test, Nickerson-Kveim or Kveim-Siltzbach test is a skin test used to detect sarcoidosis, where pa of a spleen or lymphnode from a patient with known sarcoidosis is injected into the skin of a patient suspected to have the disease. If non caseating granulomas are found (4-6 weeks later), the test is positive . Ref - pubmed.com', 'role': 'assistant'}]