RBI Grade B Officer 9 Nov 2019 Paper

The given sentence has been broken up into four different parts. The error, if any, will be in one part of the sentence. Select the option which contains the error-less combination. If all are correct mark Option 5 as your answer.
In January this year, the World Health Organization (WHO) listed (A)/ “vaccine hesitancy” as between the top 10 threats to (B)/ global health this year; it is defined as (C)/ “the reluctance or refusal to vaccinate despite the availability of vaccines”. (D)/ No error (E)