The NCERT consulted 25 external experts and 16 CBSE teachers to carry out its syllabus rationalisation exercise as part of which portions on the Mughals, Mahatma Gandhi, his assassin Nathuram Godse, reference to Hindu extremists and the 2002 Gujarat riots were dropped from school textbooks, according to the education ministry. Dropping several topics and portions from the NCERT textbooks has triggered a controversy with the Opposition blaming the Centre of "whitewashing with vengeance".