In certain beer there are, but it varies. Some cream stout use lactose in the brewing process where a small amount is left behind. Each brew is different so numbers aren't exact. Most people think it is too small to matter.
ya there is a lactose content in beer. this gives some energy to our body. in alternate to lactose fructose are used in some of them. but both taste as like the same in the beer. no change of taste..