Okay, so the sentence we will be referring to is:
The Taj Mahal in India is an exquisite building.
The adjective in this sentence is: exquisite. This is as it is describing the noun.
The noun in this sentence is: building. This is as it is a tangible object.
There are also proper nouns in this sentence which are: Taj Mahal and India. However, since the question is asking for only nouns and not proper nouns we don't need to specify them.
Therefore, our answer is as follows:
Adjective to underline - exquisite.
Noun the adjective modifies to circle - building.
