Q: 92 (CDS-I/2010)

On the above map of India, the shaded districts are those in which a particular tribal group constitutes more than 50% of the tribal population. What is that particular tribal group ?
question_subject: 
History
question_year: 
2010
question_exam: 
CDS-I
stats: 
0,744,408,240,112,56,744