<prompt> Given below is the lab details of a patient suffering from Hepatitis B virus infection. What do the test indicateHBs AgNegativeAntiHBsAgNegativeIgM antiHBCPositiveIgG anti HBCNegativeChronic infectionImmunisationWindow periodPrevious infection  <response>: IgG anti HBC is the only serological marker detectable during window period. 