In this task you are given a sentence. You must judge whether subject of the main clause is singular or plural. Label the instances as "Singular" or "Plural" based on your judgment.

[Q]: His technique was one of confident expertise.
[A]: Singular


[Q]: A mass of recruits had already gravitated to the Whites.
[A]: Singular


[Q]: " Only female Shadowhunters can enter the Adamant Citadel. "
[A]:
Plural