hello_world :- write('Hello World!').
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PROLOG
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PYTHON
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PASCAL
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PERL
A
Correct answer
Explanation
The code shows Prolog's fact/rule syntax using ':-' (horn clause operator). 'hello_world :- write('Hello World!')' defines a rule that succeeds when 'hello_world' is called and executes 'write'. This is unmistakably Prolog.