Which physical exam finding is commonly associated with gastrointestinal bleeding?

Melena refers to the presence of black, tarry stools that indicate upper gastrointestinal bleeding, as it results from the digestion of blood. This is a specific finding closely tied to gastrointestinal bleeding, making it a common manifestation. Pallor can indicate anemia resulting from significant blood loss, which is often associated with gastrointestinal bleeding, but it is not exclusive to this condition. RUQ tenderness may suggest liver or gallbladder pathology, not specifically gastrointestinal bleeding. Murphy's sign is used to assess for gallbladder inflammation and does not specifically indicate gastrointestinal bleeding. Thus, in the context of the options provided, melena is the most directly associated finding for gastrointestinal bleeding, highlighting its relevance in clinical assessments of this condition.