I'll try to get this story right, to the best of my recollections. It is some years ago....
Our hero (absolutely no sarcasm intended) is holding above one of the Channel Islands with wx well below Cat 1. He is in an old-technology turboprop, no autopilot (but a very reputable airline and a good fleet).
A passenger is taken immediately and very seriously ill. The options are not good for a return to the mainland as the weather at nearby airports there is foul, too.
The decision is taken to approach and land. Wx is OVC001 RVR 300ish. The approach and landing are carried out, uneventfully. The ambulance is on hand, and the passenger receives expert care and lives.
The CAA are informed, and praise this individual for 'saving the passenger's life'.
Moreover, he has done nothing wrong, as the requirements of the ANO 'May be departed from to the extent necessary for saving life' (paraphrasing, but I think I'm fairly close).
So, faced with the question at interview, you could recount this story, and discuss its merits, without necessarily agreeing with the action taken or its outcome.
'What if' questions are always difficult, because in considering the solution out of context, your response is atypical of that which would seem natural to you 'for real'.
BTW, the Captain mentioned above is an ex-military man of experience, and is a training management pilot.