challenge
noun
a demanding or stimulating situation
“they reacted irrationally to the challenge of Russian power”
a call to engage in a contest or fight
questioning a statement and demanding an explanation
“his challenge of the assumption that Japan is still our enemy”
a formal objection to the selection of a particular person as a juror
a demand by a sentry for a password or identification
verb
take exception to
“She challenged his claims”
issue a challenge to
“Fischer challenged Spassky to a match”
ask for identification
“The illegal immigrant was challenged by the border guard”
raise a formal objection in a court of law
Synonymstake exception
Source: WordNet 3.1, Princeton University