Officially yeah, but even Vietnamese people in Vietnam call it Saigon most of the time. Most buses have Saigon written at the top of them too. Plus, Saigon just sounds cooler.
It sure is "just your opinoin" because every quiz on this site and every English language atlas on this earth (as well as every textbook, novel, etc. ) has used "Ho Chi Minh City" for decades. You're on an English site. I'm sorry you haven't caught on, but that's been the accepted name for this city for decades. But, yeah, it's probably that the quizmaker is a dick lol
Tripoli is a city located in Lebanon,too.