Correct Answer: (b) Udhamsingh Nagar
Solution:According to Census 2011, the total population of Scheduled Tribes in Uttarakhand is 2,91,903. Bhotia, Buksa, Janionsarri, Tharu and Raji are the main tribes of the state. Tharu is the largest tribe of Uttarakhand. Most of the population of Tharu tribe resides in Udham Singh Nagar. While 98 percent of the population of Janionsarri lives in Dehradun. Kharwar tribe is found in Uttar Pradesh.