Explanation

Dr. S Jaishankar represented India at the 23rd SCO Council of Head of Government Meeting in Pakistan because he is India's current Minister of External Affairs. Sushma Swaraj was a former minister and did not represent India for this event. Narendra Modi is the Prime Minister, but Dr. Jaishankar attended as the designated representative. Rahul Gandhi is a politician who does not hold the official diplomatic role for such international meetings.