Find the odd item (currencies vs measurement unit): Select the option that is not a currency name.

Introduction / Context:
Word-classification based on economic vs physical measurement terms is straightforward. Three options are currency names used historically or currently in various countries, while one is a unit of mass, not a currency. This domain separation is categorical and non-overlapping.

Given Data / Assumptions:

• Yen: currency of Japan.
• Lira: currency name historically used by several countries (e.g., Italy historically, Turkey as Turkish Lira).
• Dollar: currency name used by multiple countries (e.g., US, Canada, Australia, etc.).
• Ounce: unit of mass/weight (avoirdupois or troy), not money.

Concept / Approach:
Classify by semantic domain: monetary units vs physical measurement units. Monetary units function as legal tender; measurement units quantify physical properties like mass.

Step-by-Step Solution:

Verification / Alternative check:
Attempt conversions: currencies convert through exchange rates; ounces convert to grams/kilograms. The conversion targets are mutually exclusive, reinforcing the split.

Why Other Options Are Wrong:
They all denote money systems rather than physical quantities.

Common Pitfalls:
Do not confuse commodity pricing (e.g., gold priced per ounce) with the ounce being a currency; it is merely a measurement unit used for pricing.

Final Answer:
Ounce