Explanation: Sohna is a town located in the Gurgaon district of Haryana, India, approximately 40 kilometers from the national capital, Delhi. It is renowned for its hot water springs, which are a significant tourist attraction and are believed to have medicinal properties. The water from these springs is strongly sulphurous, and its temperature ranges from 46$^\circ$C to 51.7$^\circ$C, making it suitable for therapeutic baths.
The hot water springs in Sohna are associated with ancient legends, particularly one involving Arjuna, one of the Pandava brothers from the epic Mahabharata. According to the legend, Arjuna dug these wells during his exile, and the water is believed to have curative effects. The main kund, known as Shiv Kund, is a large tank where the water is collected and is considered to have medicinal properties due to its sulphurous content.
The presence of sulphur in the water is significant because it is believed to have therapeutic benefits for various skin conditions and other ailments. The hot water springs in Sohna are a natural phenomenon, resulting from the geothermal activity in the region. The water is heated by the Earth's internal heat and rises to the surface through natural fissures, creating the hot springs.
Sohna's hot water springs are not only a source of local pride but also attract visitors from all over India and abroad. The town has developed facilities around the springs, including bathing areas and hotels, to cater to the needs of tourists and those seeking the therapeutic benefits of the water.
In contrast, the other options listed do not fit the specific description provided in the question. Manikaran in Himachal Pradesh is known for its hot springs but is not located near Delhi and has a different legend associated with it. Kasol is a small town in Himachal Pradesh known for trekking and scenic beauty but is not known for hot water springs. Kurukshetra, while historically significant, is not associated with hot water springs.
Understanding the unique characteristics of Sohna's hot water springs, including their temperature range, sulphurous content, and historical significance, is crucial for identifying the correct answer. The combination of these factors makes Sohna the correct choice among the given options.