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Correct Answer: Option C — **New Delhi**. **New Delhi** is the accurate answer because the Headquarters Integrated Defence Staff functions in the national capital as a tri-service organisation. This identifying fact establishes its correct connection with headquarters and distinguishes it from the other defence-related choices. Why the other options are incorrect: Option A — **Main battle tank**: This is actually associated with armoured platform; specifically, Arjun was developed as an indigenous main battle tank for armoured warfare. Option B — **Maritime patrol and reconnaissance aircraft**: This is actually associated with naval aircraft; specifically, the P-8I performs long-range maritime surveillance, reconnaissance and anti-submarine missions. Option D — **Varuna**: This is actually associated with naval exercise; specifically, Varuna is the established bilateral maritime exercise of the Indian and French navies. Exam Takeaway: Link **New Delhi** with its exact **headquarters** association for fast **Indian Defence GK** revision.
