Final answer:
In the given code sample, '(x * y) / 2' is the expression, which combines variables, operators, and values to yield a result.
Step-by-step explanation:
The question concerns differentiating between code segments, particularly identifying an expression in a given code sample. In programming, an expression is a combination of variables, operators, and values that yields a result or value.
Considering the code provided, '(x * y) / 2' qualifies as an expression as it includes variables x and y, multiplication and division operators, and an integer value, which when evaluated will produce a result. Note that for the expression to yield a meaningful result, the variable y must have been defined elsewhere in the code, which is not shown in the provided snippet.