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: Ans. is 'c' i.e., Hydatidosis Laboratory diagnosis of hvdatid cyst : Casoni's reaction Blood examination - ---> Eosinophilia Serological tests Precipitin reaction, Complement fixation test, Haemagglutination test, Flocculation test, IFA, Immuno electrophoresis (Arc 5) test. Exploratory cyst puncture Radiology X-ray, USG and CT Scan (most commonly used method for diagnosis)", 'role': 'assistant'}]