Doppelbock is often referred to as what due to its substantial character?

The term "liquid bread" is often associated with doppelbock due to the beer's rich malt profile and higher alcohol content, which can resemble the nutritional aspects of bread. The style originated in Germany and was initially created by monks who brewed it for sustenance during fasting periods. The substantial character of doppelbock, with its malty sweetness and full-bodied nature, contributes to this nickname, as it offers both flavor and a higher calorie content than regular lagers.

The other options, while they may describe different aspects or types of beer, do not capture the unique essence of doppelbock in the same way. "Nectar of the gods" is a more poetic phrase that could apply to many exceptional beers, while "strong ale" refers to a broad category not specifically tied to doppelbock. "Golden lager" does not convey the rich, darker hues and flavors typical of doppelbock, which is usually deeper in color and character compared to standard lagers.