Expensive champagne

[DKL]

One of our wedding presents was a 1990 bottle of Dom Perignon. We don't really know what to do with it!
Do we
A) Drink it
B) Sell it
C) Keep it

I've no idea what its worth but I imagine its £100+ and whilst we like wine (Honeymoon in Stellenbosch -nice wine and sooo cheap!)we might feel a bit guilty at £10 a mouthfull, but equally it was a present so we would feel a but ungrateful selling it.
Thoughts?

Cheers
David