On which of the following days is National Income Tax Day observed every year?

In which of the following states are two air-filled rubber dams being constructed with the help of South Korea?

With whom did Anupam Trivedi co-author the book ‘RSS @100: A Century of Service, Unity and Sacrifice’, which has been in the news?

In which of the following states has a new species of spreadwing damselfly named ‘Lestes palloti’ been discovered?

Which of the following state governments has announced that August 16 will be observed as Ayushman Diwas?