Substitute required?

[BayStateRef]

From a pre-season rules exam (NFHS rules):

True/False:
Substitutes are required for an injured player when a team's trainer runs onto the court to tend to an injured player.

That's it. Pick the right answer.

The rule (3-4-6) says:
"A player who has been injured to the extent that the coach or any other bench personnel is beckoned and/or comes onto the court shall be directed to leave the game, unless a time-out is requested by, and granted to, his/her team and the situation can be corrected by the end of the time-out."

What is being tested here? Whether the substitution must be made in every instance (False. A time out keeps the player in the game.) Or...that with no other information....the player must be replaced because the trainer came onto the court?