Visiting Indian Prime Minister Narendra Modi on Monday hailed India-Iran relationship as a perfect response to those who preach radicalism.Addressing an international conference, "India-Iran Two Great Civilisations: Retrospect-Prospects", organised by the Indian Council for Cultural Relations (ICCR) here, Modi said the ties between the two countries “celebrate the meeting of our great cultures” in a world that talks of strategic convergence.“It is also in perfect response to those who preach radical thoughts in our societies,” Modi said, after he released the facsimile reproduction of the Persian calligraphed manuscript of Panchatantra, the ancient Indian collection of fables originally written in Sanskrit.He said the richness of Persian heritage remained “an integral part of the fabric of Indian society” and a “part of Iranian culture lives in Indian hearts”.“The great medieval poets of India have called Persian and Sanskrit two sisters. “