Ukhrul district is famous for the Shirui Lily, a rare and beautiful flower that blooms only once a year. The flower is found in the Shirui Hills, which are located in the district. The Shirui Lily is a symbol of Ukhrul district and is a popular tourist attraction.
Dzukou Valley is a high-altitude valley located in the Ukhrul district. The valley is known for its beautiful scenery and its annual Dzukou Valley Rhododendron Festival. The festival is held in February or March and attracts visitors from all over the world.
Tharon Cave is a cave located in the Ukhrul district. The cave is known for its stalactites and stalagmites, as well as its bats. The cave is a popular tourist attraction and is also a sacred site for the local people.
Therefore, the correct answer to the question “Ukhrul district is famous for: Shirui Lily / Dzukou Valley / Tharon Cave / None of the above” is Shirui Lily.