lujteam at SemEval-2025 Task 10: Finetuning SmolLM2 with Taxonomy-based Prompting for Explaining the Dominant Narrative in Propaganda Text

XAI has been a long-standing goal of AI. Explaining why a text can be considered to have a dominant narrative, where the narrative is known, is of great importance for dealing with propaganda in the news. This paper reports on the participation of the system clujteam in Subtask 3 of Task 10 of Semveal 2025. The system obtained 7th place with a value of 0.72464 for F1macro, at 0.026 distance from the 1st place. The key components of the solution are the given taxonomy for the narratives and supervised fine-tuning of SmolLM2.