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**Question**: What is a single alternative decision structure in programming, and provide an example demonstrating its use in Python. **Answer**: A single alternative decision structure is a programming concept where a specific action is taken based on whether a condition is true or false. It consists of a condition and an action. If the condition evaluates to true, the action will be executed; otherwise, no action will be executed. An example in Python: ```python age = 16 if age >= 18: print("You are eligible to vote.") ``` In this example, if the variable "age" is greater than or equal to 18, the message "You are eligible to vote" will be printed. If "age" is not greater than or equal to 18, no action will be executed.