The verified answer to “Important Battles question: Who was Lachit Borphukan?” is Ahom commander who defeated the Mughals at Saraighat, option B. The source-backed, question-specific record explains: Lachit Borphukan was the commander-in-chief of the Ahom Kingdom who led the famous victory against the Mughal forces in the Battle of Saraighat (1671). 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. Option B gives Ahom commander who defeated the Mughals at Saraighat and satisfies every condition stated in the question. The remaining choices—A Mughal general who defeated Ahoms, A Maratha general and British general in Bengal—do not satisfy the complete requirement. Depending on the stem, a distractor may name a real commander but attach the wrong title, use a related event involving another power, reverse a correct association, or present a correct statement when the question specifically asks for the incorrect match. Replaying that method for this Important Battles question confirms Ahom commander who defeated the Mughals at Saraighat without relying on option position.