Arjuna Award winner Raghbir Singh Bhola passed away recently. He belongs to which of the following sport?

Former Indian hockey player Raghbir Singh Bhola, a two-time Olympic medallist, has passed away aged 92. In 2000, he was honored with the Arjuna Award for his achievements in hockey. He served in diverse roles such as the member of the IHF selection committee, FIH international umpire, manager of the Indian hockey team, TV commentator and government observer at the Olympic Games.