Correct Answer : Option (B) - New Delhi
The third round of the monthly sero-prevalence survey began in the National Capital Region, to analyse the situation of the Covid-19 spread.
Under the survey, using the blood samples, the presence of antibodies for Covid-19 will be checked, which will explain the extent of the spread of the virus. In the last survey, it was found that 29.1 per cent of people had antibodies. This time, the sample size will be 17,000.