NRDC (National Research Development Corporation) and DLIHCAR (which I assume is a typo and you meant to type "DLIH" or "Defence Research and Development Organisation - Defence Laboratory, Hyderabad" or something similar) are organizations related to research and development.
I'm assuming you meant to say "post on NRDC DLIHCAR 2021 top"..
Could you please clarify or provide more context about what you are trying to post or discuss regarding the "2021 top" ranking or achievement? I'd be happy to help if I can!