Your question is Consistency Across Data Sources. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
You're working on a pipeline that combines data from multiple upstream systems, and the same business entities can appear in more than one source. You want a clean, trustworthy dataset before downstream analytics or applications depend on it.
How do you ensure data consistency across multiple data sources?