Which constellation is referred to as "the Lady in the chair"?

The constellation referred to as "the Lady in the chair" is Cassiopeia. This name arises from its distinctive 'W' or 'M' shape, which resembles a woman sitting in a chair with her arms resting on the armrests. In Greek mythology, Cassiopeia was the queen of Aethiopia and is often depicted as a seated figure, which aligns with this description. The prominence of Cassiopeia in the northern sky also makes it an easily recognizable constellation, further solidifying its association with the image of a lady in a chair.

In contrast, Lyra, Gemini, and Cygnus each have their own mythological and cultural significance but do not share this specific visual or thematic connection to a seated woman, which is why they are not considered the correct answer.