In this task, you are given a context paragraph of the tweet and question. Your task is to generate right answer of given question based on given context tweet paragraph.
Q: Context: 225mm rain fell in Sydney over the last 2 days. That's the wettest 2-day period since 7-8 August 1998 #SydneyStorm BOM New South Wales (@BOM_NSW) April 22, 2015 Question: that's the wettest 2-day period since when?
A:
7-8 august 1998