Detailed Solution:
The correct answer is “Diclofenac”.
Diclofenac is the pain killer that is responsible for the near extinction of vultures in India.
This medication was widely used to treat pain and inflammation in cattle, but it proved to be toxic to vultures that fed on the carcasses of treated animals. The resulting decline in vulture populations had a significant impact on the ecosystem, as vultures play a crucial role in decomposing carcasses and preventing the spread of diseases.