 
<translate> Passage: Tata Sons Limited ita ce kamfanin mallakar Tata Group kuma tana riƙe da mafi yawan hannun jari a cikin waɗannan kamfanonin. An kafa shi a matsayin kamfanin kasuwanci a 1868. Kimanin kashi 86% na hannun jarin Tata Sons yana hannun jari ne ta hanyar amintattun amintattu waɗanda membobin dangin Tata suka bayar. Manyan biyu daga cikin wadannan amintattu sune Sir Dorabji Tata Trust da Sir Ratan Tata Trust. Tata Sons shine mai mallakar sunan Tata da alamun kasuwanci na Tata, waɗanda aka yi rajista a Indiya da wasu ƙasashe da yawa. TCS kadai tana samar da kashi 70% na kudaden shiga na kamfanin mahaifiyarta, Tata Sons. Natarajan Chandrasekaran ya karɓi matsayin Shugaban Tata Sons a ranar 21 ga Fabrairun 2017.  Tambaya: Bisa ga wannan nassi, wa ya zama shugaban 'ya'yan tata a shekara ta 2017? Ruwa na sani a kasa: <eng> Passage: Tata Sons Limited is the holding company of the Tata Group and holds the bulk of shareholding in these companies. It was established as a trading enterprise in 1868. About 86 % of the equity capital of Tata Sons is held by philanthropic trusts endowed by members of the Tata family. The biggest two of these trusts are the Sir Dorabji Tata Trust and Sir Ratan Tata Trust. Tata Sons is the owner of the Tata name and the Tata trademarks, which are registered in India and several other countries. TCS alone generates 70 % revenues of its parent company, Tata Sons. Natarajan Chandrasekaran took over as Chairman of Tata Sons on 21 February 2017.

Question: Based on this passage, who become the chairmen of tata sons in 2017?
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