Answer the following question given this paragraph: 

Old Faithful is the best-known geyser in the world. You can see a picture of it in Figure below . The geyser erupts faithfully every 90 minutes, day after day. During each eruption, it may release as much as 30,000 liters of water!.


Q: What is the best-known geyser in the world that also faithfully erupts every 90 minutes?


A:
old faithful