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
Arc-C-5 in Countercurrent electrophoresis of Serum is diagnostic of? 
Select and explain. 
A. Cysticercosis, B. Cryptococcosis, C. Hydatidosis, D. Brucellosis
C: Hydatidosis
Answer: C: Hydatidosis 
Explanation: 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)