This is a direct fact question about a well known Indian research institute.
The National Chemical Laboratory is a CSIR laboratory dedicated to chemical research, well known for its work on catalysts and polymers.
Its location, Pune, is often tested in general science questions alongside other CSIR labs such as the Central Drug Research Institute in Lucknow or the National Physical Laboratory in New Delhi.
Since none of New Delhi, Bangalore or Patna host the National Chemical Laboratory, the only correct match is Pune.