I have been interviewing for technical trainer position in a medical company.In my last interview I was given an assignment to do a presentation on a specific medical device.I have been given a 255 page device manual and asked to do the presentation in German.

My German is good in conversational level and the interviewer is aware of that. I was asked to prepare the presentation for 4 hour long and they would choose the topic on the day of the interview and ask me to present it.

What sort of points should I consider when asked to do a presentation on such broad topic?

I have been interviewing for technical trainer position in a medical company.In my last interview I was given an assignment to do a presentation on a specific medical device.I have been given a 255 page device manual and asked to do the presentation in German.

My German is good in conversational level and the interviewer is aware of that. This was the instruction I received: If I were to given this job I would normally conduct a 4 hour presentation to individuals who would like to learn about this machine. My task for the next level of interview is to prepare such a presentation, but the interviewer would select a topic on the spot and ask me to present it for 1 hour.

My questions are: What sort of points should I consider when asked to do a presentation on such broad topic?

Would it be a red flag ,if I call the interviewer and ask for a selective topic?