Question: What is the lake inflow and the drainage basin of the Hoover Dam?
Paraphrase: What lake is formed by Hoover Dam, and which river does it drain into?
SPARQL (Wikidata): SELECT ?ans_1 ?ans_2 WHERE { wd:Q172822 wdt:P200 ?ans_1 . wd:Q172822 wdt:P4614 ?ans_2 }
Answer: Colorado River, Colorado River basin