After confidential meeting between National Security Advisers of India and Pakistan in Bangkok, foreign minister Sushma Swaraj went to Pakistan to attend ‘Hear of Asia Conference’ held in 2015 at

The correct answer is D) Islamabad. The Heart of Asia Conference, a regional platform on Afghan security and cooperation that grew out of the 2011 Istanbul Process, was held in Islamabad on 9 December 2015. Sushma Swaraj attended as External Affairs Minister. It followed the NSA-level talks between Ajit Doval and Nasir Janjua in Bangkok that same month.

• Karachi is Pakistan's largest city and commercial hub, but it is not the capital and did not host this conference.
• Lahore is Punjab's capital and was the venue of PM Modi's unannounced stop on 25 December 2015, which was a separate bilateral visit and not the conference.
• Peshawar, capital of Khyber Pakhtunkhwa near the Afghan border, is the wrong city for a summit of this scale.

For Mains, this episode sits in the debate on India's Afghanistan policy and whether dialogue with Pakistan can run alongside counter-terror concerns.

Trap: candidates pick Karachi or Lahore because they are better known, or mix up Modi's Lahore visit with the conference itself. Check the venue against the event, not the city's fame.