The correct answer is: Lord Shiva.
Manikaran is a Hindu pilgrimage site in the Kullu valley of Himachal Pradesh, India. It is associated with Lord Shiva and is said to be one of the 12 Jyotirlingas, or most sacred shrines of Shiva. The site is believed to have been created when Shiva dropped a few drops of his sweat while meditating. These drops turned into three sacred springs, which are said to have healing powers.
The main temple at Manikaran is dedicated to Lord Shiva. It is a small, simple temple that is built in the Nagara style of architecture. The temple is surrounded by a number of smaller temples and shrines, which are dedicated to other Hindu deities.
Manikaran is a popular tourist destination and is known for its hot springs. The hot springs are said to have medicinal properties and are believed to cure a variety of diseases. The site is also popular for its natural beauty and is a popular spot for trekking and hiking.
The other options are incorrect because they are not associated with Manikaran. Lord Vishnu is the preserver god in Hinduism and is associated with a number of other temples in India. Lord Krishna is the eighth avatar of Vishnu and is associated with a number of temples in India, including the Krishna temple in Mathura. Lord Brahma is the creator god in Hinduism and is associated with a number of temples in India, including the Brahma temple in Pushkar.