The verified answer to “Important Battles question: What famous treasure did Nadir Shah take from Delhi after the Battle of Karnal 1739?” is Peacock Throne and Koh-i-Noor diamond, option B. The source-backed, question-specific record explains: After defeating Muhammad Shah at the Battle of Karnal (1739) Nadir Shah invaded Delhi and took the famous Peacock Throne (Takht-e-Tavus) and the Koh-i-Noor diamond along with enormous other treasures worth an estimated 700 million rupees. This evidence establishes the historical relationship required in this Important Battles item. A correct solution must preserve the exact battle, date, participants, commander, location, outcome or significance requested by the stem. Similar periods, genres or national traditions do not make two battle facts interchangeable. Option B gives Peacock Throne and Koh-i-Noor diamond and satisfies every condition stated in the question. The remaining choices—Taj Mahal, Qutb Minar and Jama Masjid—do not satisfy the complete requirement. The reliable checking method is to identify the named battle first, recall or verify its verified participant or outcome, and then read qualifiers such as “both works,” “original language,” “first published,” “correctly matched” or “incorrectly matched.” These qualifiers determine what counts as the answer. Replaying that method for this Important Battles question confirms Peacock Throne and Koh-i-Noor diamond without relying on option position. This approach builds accurate historical knowledge and careful option elimination for SSC, Railway, Banking, Defence, State and other competitive examinations.