The first writer to use Urdu as the medium of poetic expression was _____________.
A. Amir Khusrau
B. Mirza Galib
C. Bahadur Shah Zafar
D. Al- Beruni

Hint: Urdu Language developed in North India and in Delhi around the 12th century. This language was heavily influenced by Arabic and Persian, as well as Turkish languages. During the 14th and 15th centuries, poetry began to be written in Urdu.

Complete answer: Amir Khusrau ( 1253-1325 CE.) used Urdu for the first time as the medium of poetic expression. He was a Persian musician, poet, and scholar associated with the ruler of Delhi sultanate. He was a mystic and a spiritual disciple of Nizamuddin Auliya of Delhi. He is regarded as the " Father of qawwali".
Mirza Ghalib is known simply as Ghalib. He saw the declining phase of the Mughal era and the emerging phase of British colonialism. His favourite subject was love, Philosophy and mysticism for writing poetry.
Looking at the options given:
Option A. Amir khusrau used Urdu for the first time as the medium of poetic expression. This is the correct answer.
Option B. Mirza Ghalib was a well-known poet in the Persian and Urdu languages. His favourite subject was love, Philosophy and mysticism. It is an incorrect option.
Option C. Bahadur Shah Zafar was the last Mughal emperor. It is an incorrect option.
Option D. Al- Beruni was an Iranian scholar and also known as " Father of Indology". It is an incorrect option.
Therefore, Option A is the correct option.

Note: Books written by Amir Khusrau are Miftah ul - Futuh, Tughlaq Nama and Nuh- Sipihr.