Answer the following question given this paragraph: 

Formaldehyde is a gas at room temperature. Acetaldehyde boils at 20°C; in an open vessel, it boils away in a warm room. Most other common aldehydes are liquids at room temperature.


Q: What form does formaldehyde take at room temperature?

 Choices:

- solid

- liquids

- plasma

- gas

A:
gas
