The 2022 Chess Olympiad is hosted in Chennai, India. Why does India get to field three teams while most nations get the usual one team per Open and Women's sections?
Normally the host nation is entitled to a second team. Following the absence of Russia and Belarus due to FIDE ban, China due to pandemic lockdowns, and last-minute Pakistan pullout due to political conflict with India, the number of teams was odd, so FIDE rules allow another team to India.
According to FIDE regulations:
Odd Number of Participating Teams
2.1 The organising federation shall be entitled to enter a second team ("B" team). If there is an odd number of participating teams the organising federation has the right to enter a third team ("C" team).
I have not found the FIDE Council rationale for this, but I guess this is an extra reward to the host nation (who has to fund the event), and is more exciting than a bye. (If you know, please post as an answer)