Multiple choice general knowledge Citibank started co-branding its credit cards first with which oil company? IBP HPCL ONGC IOC Reveal answer Fill a bubble to check yourself D Correct answer Explanation Citibank first started co-branding its credit cards with Indian Oil Corporation (IOC) in the late 1990s. This was one of the earliest co-branded card partnerships in India combining fuel purchases with credit card facilities.