The correct answer is Jaisalmer. Jaisalmer city of Rajasthan is famous for its yellow stone business. Jaisalmer city is built to the east and north of the famous Jaisalmer Fort, which is the crown jewel of the city.

1. The first biological park of Rajasthan is 'Sajjangarh Biological Park' located in Udaipur district, which was inaugurated on 12 April 2015 by the then Environment Minister Prakash Javedkar.

2. It is situated at the foothills of Sajjangarh Monsoon Palace, 8 kilometres away from Udaipur city. Mainly tigers, panthers, lions, reptiles, nilgai, sambar, wild boar and honeys are found in this park.

3. 5 Biological Parks of Rajasthan which include Sajjangarh Biological Park (Udaipur), Machia Biological Park (Jodhpur), Nahargarh Biological Park (Jaipur), Abheda Biological Park (Kota), Marudhara Biological Park (Bikaner) etc.