Congress leader Rahul Gandhi Sunday said the OBC, Dalit and tribal constitute 73 per cent of the population but not even one of the top 200 companies in India is owned by them. Addressing a gathering during his Bharat Jodo Nyay Yatra here, he said a caste census is an X-ray of the country which would "reveal everything". "Caste census is your (youth's) weapon and you have to find out what is your population," he told the gathering as he came of the Swaraj Bhawan, at Lakshmi Talkies intersection near Allahabad University. "Secondly, you have to find out what is your share in the country's wealth." "How much wealth do the 73 per cent castes have in this country? Caste census is the X-ray of the country. This will reveal everything," he said. Gandhi called a student from the crowd to his vehicle and asked him, "Which class do you belong to?" The student replied that he was from the OBC category. On this, Gandhi said, "The OBC class in the country is 50 per cent, Dalits are 15 per cent