The correct statement about Sirius is: It is the brightest star in the night sky.
Sirius, also known as the Dog Star, is indeed the brightest star visible from Earth at night. It is part of the constellation Canis Major and is much brighter than our Sun, although it is considered to be slightly smaller in radius. However, it is essential to note that Sirius is a binary star system, consisting of Sirius A and Sirius B.