Classify the following cities as metropolitan or rural
Berlin, Geneva, Boise
- Berlin is a metropolitan city.
- Geneva is a metropolitan city.
- Boise is a metropolitan city, but it is towards the smaller side in terms of population and could be classified as a small metro or urban area.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following cities as metropolitan or rural

### Input:
Berlin, Geneva, Boise

### Output:
- Berlin is a metropolitan city.
- Geneva is a metropolitan city.
- Boise is a metropolitan city, but it is towards the smaller side in terms of population and could be classified as a small metro or urban area.