Definition: You will be given three sentences. Read them, then identify a noun phrase (person, place, or thing) or event that is shared between all three sentences. As the output, write the span of the text corresponding to that phrase in each sentence. Keep the order of the sentences, that is, your answer should look like: 1: *a phras from sentence 1e* 2: *a phras from sentence 2* 3: *a phrase from sentence 3*
Input: 1: But as with any potential threat to human health , they are preparing for the worst just in case . 2:  The risk to humans is low , our food supply is safe ,  said Dr . John Clifford , the USDA 's Chief Veterinary Officer . 3: The CDC says  the risk to humans is low ,  but , as always , they are preparing for the worst case .

1: they 2: USDA 3: The CDC