What are the 3 most common multidrug resistant organisms?

Extended-spectrum beta-lactamases (ESBL), Vancomycin-resistant enterococci (VRE) , and Methicillin/oxacillin-resistant Staphylococcus aureus (MRSA).You can read about Antimicrobial Resistance – Definition, Causes & Types in the given link.

Further readings:

1. Topic-Wise GS 3 Questions for UPSC Mains
2. Science & Technology Notes For UPSC – General Science Notes