Classify the following sentence as either a metaphor or hyperbole.
The room was so hot it felt like a sauna.
The sentence "The room was so hot it felt like a sauna" is a metaphor.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following sentence as either a metaphor or hyperbole.

### Input:
The room was so hot it felt like a sauna.

### Output:
The sentence "The room was so hot it felt like a sauna" is a metaphor.