Correct answer: D. Mamluk dynasty
Explanation: The direct answer is D: Qutbuddin Aibak is associated with the Mamluk, also called the Slave, dynasty. To solve this, place him at the beginning of the Delhi Sultanate sequence. Muhammad Ghori’s death in 1206 left power in north India, and his former slave and military commander Qutbuddin Aibak established his rule in Delhi. This beginning is dated to 1206, so he is regarded as the founder of the Mamluk or Slave dynasty. Option D is correct because both names refer to the same dynasty. Option A, the Tughlaq dynasty, came much later and is associated with rulers such as Ghiyasuddin Tughlaq and Muhammad bin Tughlaq. Option B, the Khalji dynasty, followed the Mamluks and began with Jalaluddin Khalji. Option C, the Lodi dynasty, was a later Afghan dynasty and included rulers such as Sikandar Lodi and Ibrahim Lodi. The word “Mamluk” means slave, referring to the military-slave background of the early rulers; it does not mean that the dynasty had no political power. Memory cue: Aibak began the Delhi Sultanate’s Mamluk/Slave line in 1206; Khalji, Tughlaq, and Lodi came later.