Correct Answer: (b) Qutbuddin Aibak
Note: The first ruler of the Slave Dynasty (or named as Gulam Dynasty) was Qutbuddin Aibak who ruled from 1206 to 1210 A.D. He established his capital at Lahore. Qutbuddin Aibak was born in Turkistan. Though he was ugly in appearance, he was intelligent and impressive in behaviour. He was taken as a prisoner and sold to the Qazi of Nishapur named Fakhruddin as a slave in his childhood. He was taken care and provided with proper education and military training by the kind-hearted Qazi but soon after the death of the Qazi, his sons sold Aybak to Muhammad Ghori. He was well versed in Islamic theology, horse riding and swordsmanship. Owing to his skill and qualities, he soon attracted the attention of his master and was appointed commander of a troop. Shortly afterwards battles; he was promoted to the post of Amir-i-Akhur, the master of the royal stable. When ghori invaded India, Aibak came with his master and provided him his active support during battles. The successes of his master by and large depended on his military skill. Ghori was immensely Indian empire. In 1206 A.D., on his way to Ghazni, Ghori died. His empire was inherited by his salves, as he had no son to jsucceed him. Aybak, who was a viceroy of his Indian Empire was invited by the Amirs of Lahore to assume the powers. He bestowed the title of Malik and sipahasalaar on himself. Muhammad Ghori had no male successor to inherit his empire; hence his nephew, Ghiyasuddin Mahmud ascended the throne of Ghori after his death in 1206 A.D.