Answer the following question given this paragraph: 

In the forward reaction, hydrogen and iodine combine to form hydrogen iodide. In the reverse reaction, hydrogen iodide decomposes back into hydrogen and iodine. The two reactions can be combined into one equation by the use of a double arrow.


Q: In the forward reaction, hydrogen and iodine combine to form what?

 Choices:

- hydrogen ionicide

- ionic hydrogen

- iodinic hydrogen

- hydrogen iodide

A:
hydrogen iodide
