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': 'Arc-C-5 in Countercurrent electrophoresis of Serum is diagnostic of- \nSelect and explain. \nA. Cysticercosis, B. Cryptococcosis, C. Hydatidosis, D. Brucellosis', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]