Which star is known as a red giant located in the Taurus constellation?

Aldebaran is recognized as a red giant star situated in the Taurus constellation. It is the brightest star in Taurus and is often referred to as the "Eye of the Bull," due to its prominent position in the constellation. As a red giant, Aldebaran has undergone significant changes in its life cycle, expanding and cooling after exhausting the hydrogen fuel in its core. This change gives it its characteristic reddish hue, distinguishing it from hotter, blue stars.

In contrast, other choices represent different types of stars and are located in different circumstances. Sirius is a binary star system and is the brightest star in the night sky but is not a red giant. Betelgeuse is also a well-known red giant, but it belongs to the Orion constellation rather than Taurus. Procyon, like Sirius, is part of another constellation (Canis Minor) and is classified as a binary star system as well. Therefore, Aldebaran is uniquely identified as the red giant star of Taurus.