This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Parasitology, Subject name: Microbiology
[{'content': 'ARC-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(Ref: Harrison, 19th/e, p. 1433)* Serological test for hydatid cyst: Precipitin reaction, Complement fixation test, Hemagglutination test, Flocculation test, IFA, Immuno electrophoresis (Arc 5) test.Detection of antibody to specific echinococcal antigens by immunoblotting has the highest degree of specificity. Q", 'role': 'assistant'}]