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: Microbiology
[{'content': "Frenkel's skin test is positive in- \nSelect and explain. \nA. Spinal cord compression, B. Toxoplasmosis, C. Pemphigus, D. Pemphigoid", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]