You will be given a definition of a task first, then some input of the task.
In this task, you are given a set of context paragraphs, some supporting facts and an answer of a question. Your task is to generate question for given answer based on set of context paragraphs, supporting facts and an answer.

Context_1 : Prestwich ( ) is a town within the Metropolitan Borough of Bury, in Greater Manchester, England. It lies close to the River Irwell, 3.3 mi north of Manchester city centre, 3.1 mi north of Salford and 4.7 mi south of Bury. Context_2 : Simister is a small village in Prestwich, within the Metropolitan Borough of Bury, Greater Manchester. Historically part of Lancashire, it is located between the districts of Prestwich, Rhodes and Langley. The village is located east of "Simister Island", motorway junction 18 which links the M62, M66 and M60 motorways. Thousands of vehicles a day use this motorway intersection and the traffic noise is often regarded as a nuisance but not a part of the village by the residents. Although the village's proximity to Manchester means the residential population is mainly made up of commuters, the village has a rural feel with much agricultural activity. The main thoroughfare, Simister Lane, is often used as a rat run for cars travelling to and from Prestwich, Middleton and Junction 19 of the M60. fact_1 : Simister is a small village in Prestwich, within the Metropolitan Borough of Bury, Greater Manchester. fact_2 : It lies close to the River Irwell, 3.3 mi north of Manchester city centre, 3.1 mi north of Salford and 4.7 mi south of Bury. Answer: River Irwell
Output:
What river is Simister near?