The Buddhist text 'Milindapanho' is in the form of a dialogue between the Indo-Greek king Menander and the monk:

The "Milindapanho" ("The Questions of King Milinda") is a famous Buddhist text written in Pali, probably composed between about 100 BCE and 200 CE. It records a dialogue between the Indo-Greek king Menander I, called "Milinda" in Indian sources, and the learned Buddhist monk Nagasena.

In the text, King Milinda, a clever debater, asks Nagasena difficult philosophical questions about Buddhist teachings, such as the nature of the self (non-self or anatta), rebirth, karma and nirvana. Nagasena answers using simple and memorable examples. For instance, he uses the example of a chariot, which is only a collection of parts and not something separate from them, to explain that there is no permanent self, only a combination of physical and mental elements. According to the text, Menander was so impressed that he became a follower of Buddhism. The text is regarded as a non-canonical but highly respected work in Theravada Buddhism, and it is included in the Pali canon in Myanmar.

Menander I (Milinda) ruled from about 165 to 130 BCE. He was the most famous of the Indo-Greek kings, who ruled over parts of north-western India and present-day Afghanistan and Pakistan after the decline of the Mauryas. His capital was Sakala (Sagala), present-day Sialkot in Pakistan. He extended his kingdom into the Ganga valley. The Greek historian Strabo and the Roman historian Plutarch mention him. Many of his silver and copper coins have been found, some carrying the Buddhist symbol of the dharma chakra (wheel).

The Indo-Greeks were the first rulers in India to issue coins bearing the names and portraits of kings, and are often credited with the first gold coins in India. They introduced Hellenistic (Greek) art, which influenced the Gandhara school of art.

Why not the other options?

• ✗Nagarjuna founded the Madhyamika school of Mahayana Buddhism.
• ✗Ashvaghosha wrote the "Buddhacharita" and was at Kanishka's court.
• ✗Upagupta is believed to have converted Ashoka to Buddhism.