The Pleiades cluster consists of a number of bright stars wrapped in a cloud of gas and dust that appears blue.This cluster is an example of a:

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The Pleiades cluster appears blue due to the reflection of starlight off the surrounding gas and dust, which is characteristic of a reflection nebula. The cluster is not a giant molecular cloud or a dark nebula, as it consists of bright stars rather than dense and opaque gas/dust. While it is true that the Pleiades cluster is a region of active star formation, the specific term "stellar nursery" is not typically used to describe clusters that are already populated with stars.

The Pleiades Cluster Consists of a Number of Bright Stars