Lisan-ul-Ghalib was the biography of:

The title Lisan-ul-Ghalib literally translates to "The Tongue of Ghalib," and it is a biographical work or an honorific title often associated with Mirza Asadullah Khan Ghalib. Ghalib was one of the most influential poets of the Urdu and Persian languages during the last years of the Mughal Empire. The direct reference to "Ghalib" in the title makes it the accurate choice for whose biography it represents.

• Option A, "Saadi," refers to Saadi Shirazi, a major Persian poet of the medieval period.
• Option B, "Hafiz," refers to Hafiz Shirazi, another celebrated Persian lyric poet.
• Option D, "Rumi," refers to a 13th-century Persian poet, Islamic scholar, and theologian.

These are all renowned poets, but "Lisan-ul-Ghalib" specifically pertains to Mirza Ghalib.