Mawlynnong village which is also credited as Asia's cleanest village is…

Static-GK 'famous place' questions test whether a well-known landmark, village, or monument is correctly mapped to its home state, since the fact is a fixed geographic association rather than something computed.

Mawlynnong is a village in the East Khasi Hills district of Meghalaya, in India's north-east. Discover India magazine named it Asia's cleanest village in 2003, and the village has sustained that reputation for cleanliness through community-led daily sweeping, bamboo dustbins, and a strict ban on littering enforced by the village council. Because this cleanliness reputation is tied specifically to the Khasi Hills, the blank in the stem is filled by Meghalaya.

• Nagaland: a north-eastern state bordering Myanmar, known for the Hornbill Festival and the war cemetery at Kohima.

• Sikkim: located in the eastern Himalayas and recognised as India's first fully organic state, with Kanchenjunga on its border.

• Meghalaya: contains the East Khasi Hills district and is among India's wettest regions, home to Cherrapunji and Mawsynram.

• Mizoram: a north-eastern state bordering Myanmar and Bangladesh, known for the bamboo Cheraw dance and a high literacy rate.

So the correct state is Meghalaya.