<prompt> Arc-C-5 in Countercurrent electrophoresis of Serum is diagnostic of?CysticercosisCryptococcosisHydatidosisBrucellosis  <response>: Ans. is c i.e., Hydatidosis Laboratory diagnosis of hvdatid cyst : Casonis 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 