What is the relationship between HDFC and HDFC Bank in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Major gainers were Hindunilver (4.24per cent), Bharti Artl (4.12per cent), Axis Bank (3.59per cent), Lupin (3.45per cent), BHEL (3.01per cent), ITC (2.26per cent), HDFC (2.15per cent), Cipla (1.98 per cent), Bajaj Auto (1.81 per cent), Coal India (1.60 per cent), Dr Reddys (1.67 per cent), L&T (1.56 per cent), Heromotoco (1.20 per cent), HDFC Bank (1.06 per cent), SBI (1.43 per cent), Reliance (0.72 per cent), M&M (0.98 per cent) and NT per cent (0.87 per cent).

Answer: operator