The correct answer is: A. Vishwamitra
Dhosri pilgrimage is associated with the sage Vishwamitra. It is a Hindu pilgrimage site located in the Indian state of Uttarakhand. The site is believed to be the place where Vishwamitra performed a penance to please the god Indra.
Vishwamitra was a king who renounced his kingdom to become a sage. He is one of the most important sages in Hinduism. He is credited with writing the Rig Veda, one of the four Vedas. He is also the author of many other Hindu texts, including the Mahabharata and the Ramayana.
Bhrigu is another important sage in Hinduism. He is the son of Brahma, the creator god. He is the ancestor of the Bhrigu clan, which includes many other important sages.
Chyavan is a sage who is said to have lived for over 100 years. He is known for his knowledge of herbs and medicine. He is also said to have been the teacher of the god Indra.
None of these is the correct answer.