Classification — person and association: pick the pair that is NOT “person : organization/group,” but rather “person : building/place.”

Introduction / Context:
Three pairs connect a person to the organization/group they belong to or lead. One pair connects a person to a building/place instead of a group.

Given Data / Assumptions:

• Principal : School → head of an institution (organization).
• Artist : Troupe → member of a performing group.
• Singer : Chorus → member of a vocal group.
• Soldier : Barrack → barrack is a building/place where soldiers stay, not a group.

Concept / Approach:
Distinguish organization/group from physical place/building.

Step-by-Step Solution:

Verification / Alternative check:
Ask: does the right-hand term denote a collective of people? “Barrack” does not; “school/troupe/chorus” do.

Why Other Options Are Wrong:
They preserve the group-oriented relation.

Common Pitfalls:
Assuming any association qualifies; category (group vs place) matters.

Final Answer:
Soldier : Barrack