Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) Residents of Flint, Michigan, already reeling because of lead contamination in their drinking water, got more disturbing news on Wednesday. Gov. Rick Snyder announced the number of cases of Legionnaires' disease has spiked in Genesee County in the two years since Flint switched its water supply from the Great Lakes to the Flint River. But the increase cannot be directly attributed to the switch, said Nick Lyon, director of the Michigan Department of Health and Human Services. Not all the people who got Legionnaires' were exposed to Flint water, he said. From June 2014 to November 2015, at least 87 county residents developed Legionnaires' disease, compared to between six and 13 cases in the four preceding years, Lyon said. Ten patients died, he said.Legionnaires' disease has spiked in Genesee County, Michigan Gov. Rick Snyder saidThe increase happened after Flint switched its water source from the Great Lakes to the Flint RiverHealth officials say they can't directly attribute the increase to the water switch 
 Question:It was discovered the water had high levels of iron, from the _, and contained lead from the connecting pipes.

Flint