Final answer:
The original Trojan horse appears in Homer's The Odyssey.
Step-by-step explanation:
The original Trojan horse appears in Homer's The Odyssey. The Iliad, on the other hand, focuses on the events of the Trojan War and the conflict between the Greeks and the Trojans. The Trojan horse is a significant part of the story in The Odyssey, as it was a cunning stratagem used by the Greeks to infiltrate and conquer the city of Troy.