You can add an image or an MP3 audio file, or embed a YouTube video. In fact you can embed all kinds of online media using the appropriate HTML embed code.
What you can’t do is use multimedia as the answer options (e.g. click on the image that most closely resembles the tidyness of your desk) but there are work-arounds.
For example, an audio clip could have five short clips, introduced as A,B, C, D and E (you could quickly edit this together in Audacity) and then the question could be “Which of these five short phrases quotes do you think sounds the most sincere?”
Or you could use an image editor to assemble four images and add labels to identify each:
Q: Which of these fungi are deadly poisonous? (Choose one or more)