Dzongkha is the official language of Bhutan, but many regions in Bhutan still retain their native dialects due to their isolation. As people are receiving education, especially those in urban areas, are getting more familiar with the English language, which is also the medium of instruction in Bhutan. The Tantric form of Mahayana Buddhism is the official religion of Bhutan. It is an important factor in the development of Bhutanese society. Bhutan villages are strewn with temples and religious structures, which are present along the roads and trails. One can also see many prayer flags on the hills and high passes. Almost all the homes in Bhutan have a special area where a small shrine is placed. The national dress of Bhutan originated from the time of the first Shabdrung. The men in Bhutan wear a "gho," a long knee-length robe that is tied around the waist by a belt and the women wear a "kira," which is an ankle-length dress worn with a short jacket. To preserve the ancient customs from being influenced by the West, the Bhutanese government has made it compulsory for all Bhutanese to wear only their national dress in public. Bhutan's national sport is Archery, which is played here with unique Bhutanese rules and equipment. The equipments like the traditional bows and arrows are made out of bamboo and the teams of archers shoot at targets only 30 centimeters in diameter from a distance of 120 meters. Each team has a noisy crowd of supporters who, as well as encouraging their own side and try to out off the opposition.