New Delhi: The government on Tuesday appointed senior IAS officer Lokhande Prashant Sitaram as the new chairman of the Central Board of Secondary Education.CBSE) amid a major controversy over the board’s new on-screen marking (OSM) system.he will succeed Rahul SinghWho was transferred a few hours ago along with the then CBSE Secretary Himanshu Gupta.According to an official notification, Singh will now be posted as Additional Secretary in the Department of Agriculture and Farmers Welfare in the Ministry of Agriculture and Farmers Welfare.(This is a developing story)