Was lying to the NAZI authorities during WWII constitute sin?

Person A picks up a Jewish person in Poland during WWII. NAZI authorities come and ask Person A if he/she is keeping any Jewish people. Person A replies “No way” and the NAZI authorities leave. Person A has lied which is a sin. Would Person A have to confess this sin or is his/her action morally neutral.

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[LIST]
]Is it always a sin to lie?
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Is it okay to lie under certain circumstances?**
]* Can I lie to keep family peace?**
]%between%Can I lie to my mother who has Alzheimer’s Disease?
]
Is it okay to lie in order to prevent an abortion?**
]* Are little white lies a sin?**
]* Is it always a sin to lie?**
]* At what point does lying become a mortal sin?**
]* Did I sin?**
]* Did Jesus lie?**
]* Is it lying if you unknowingly say something that isn’t true?**
]* Can circumstances change morality?**
]* Can you reserve the truth?**
]* Is it lying to tell kids there is a Santa?**
]* What about lying in undercover work?**
[/LIST]

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