The correct answer is SAIL.

• SAIL is a public sector industry.
  • Steel Authority of India Limited (SAIL) is an Indian state-owned steel making company based in New Delhi, India.
  • SAIL traces its origin to the Hindustan Steel Limited (HSL) which was set up on 19 January 1954.
  • It is a public sector undertaking, owned and operated by the Government of India.
  • SAIL operates and owns 5 integrated steel plants at Bhilai, Rourkela, Durgapur, Bokaro, and Burnpur(Asansol) and 3 special steel plants at Salem, Durgapur, and Bhadravathi.
  • It also owns a Ferro Alloy plant at Chandrapur. 

• Amul is an Indian dairy cooperative society, based at Anand in the Indian state of Gujarat formed in 1946. 
  • Amul brand is today managed by the Gujarat Co-operative Milk Marketing Federation Ltd (GCMMF) which is jointly owned by about 3,000,000 milk producers in the state.
  • AMUL stands for Anand Milk Union Limited.
• TISCO is known as Tata Steel, which has grown to the world’s 7th largest Steel Company.
  • In terms of domestic production, Tata Steel is the largest company in India.
  • The main plant of Tata Steel is located in Jamshedpur and registered office in Mumbai.
  • The name of the town where TISCO was founded by Jamshedji was given by Lord Chelmsford in 1919.
• Reliance Petroleum is an Indian petroleum company that specializes in oil and energy owned by Seema Bindal of Reliance Industries Limited.
  • It is based in Ahmedabad, Gujarat, India, and has interests in the downstream oil business.