original_query: What is one of the toughest dilemmas facing critics today?
query: What is one of the toughest dilemmas facing critics today, according to Vincent Canby?
answer: According to Vincent Canby, one of the toughest dilemmas facing critics today is the difficulty of accurately describing new movies without inadvertently writing phrases that can be used as advertising come-ons, largely due to Warhol's pioneering work in films like Chelsea Girls and My Hustler.