<prompt> ARC-5 in countercurrent electrophoresis of serum is diagnostic of:CysticercosisCryptococcosisHydatidosisBrucellosis  <response>: Ans. is c i.e., HydatidosisRef: Harrison, 19the, 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 