Is chateaubriand really the most expensive wine in the world, why?

it might be, not sure why

Note that Chateaubriand (capitals for names, please) is a way of preparing beef.

The top chateaux in Bordeaux certainly sell some of the most expensive wines on the planet, as do the top vineyards in Burgundy, though most are not called chateaux.

The most highly priced varies from year to year, depending on the quality and quantity of the harvest.

Other very highly priced wines are vintage champagnes, and German ice wines, especially if they are 'Christwein Eiswein,' when the grapes are, in an exceptional year, picked on Christmas Day, probably less than one year in ten.

Chateauneuf-du-Pape is another high-value wine. Note spelling - no 'x'.

It's not even WINE. It's beef. Do you know how to use Google? It can save you a lot of embarrassment. Especially if you plan to go to a restaurant anytime soon. 

Aaaaayaaaaaluh. Hm?

Chateaubriand is a steak dish made from a  center cut filet mignon and a wine sauce. The most expensive bottle of wine was a 1992 Screaming Eagle Cabernet which went for $500,000.

Chateaubriand is  a cut of beef, a Chateau Lafite is an expensive wine.  

Chateaubriand is a steak. I think you're thinking of Chateaux-neuf-du-Pape. How expensive it is depends on the vintage.