रशियातील राष्ट्रीय खनिज संशोधन केंद्र स्कोचिन्स्की खनिज संस्थेशी सहयोग करार कोणी केला ?

The correct answer is Option D (O.N.G.C.).

Key Points:
• Oil and Natural Gas Corporation Limited (ONGC / ओ. एन. जी. सी.) signed a bilateral memorandum and technological agreement with the prestigious National Mining Research Centre - Skochinsky Institute of Mining in Russia.
• The collaboration focused on cutting-edge Underground Coal Gasification (UCG) technologies, sub-surface mining research, and advanced geo-mechanical exploration techniques.
• The objective was to extract energy from un-mineable, deep coal deposits by gasifying them in-situ into synthesis gas (syngas).
• Other central PSUs in options: HPCL focuses on downstream oil refining/marketing, NTPC on thermal/renewable power generation, and GAIL on natural gas transmission/pipeline infrastructure.
• The official MPSC final answer key confirms Option 4 (ONGC).
• Key Takeaway: ONGC entered into a collaborative research agreement with the Skochinsky Institute of Mining in Russia.