Which data type can hold one of two values: true or false?

• A. Strings
• B. Boolean
• C. Numbers
• D. Char

Answer: (B)

The concept being tested is how programs represent binary decisions. The data type that can hold one of two values, true or false, is the boolean type. Booleans are used to control the flow of code through conditional statements and logic operations, making them essential for decisions like whether to execute a block of code or loop again.

This distinguishes them from strings, which store text, numbers, which store numeric values, and chars, which represent single characters. In most languages, true and false are the two boolean literals provided to evaluate conditions, compare values, and drive branching, making boolean the natural fit for representing a binary yes/no or on/off state.