A few sample questions a potential clinical trial participant may ask:
What is the purpose of this trial?
Who reviews patient safety?
What are the possible short term and long term risks?
What are my other treatment options?
Who is charge of my care if I participate?
Will this cost me anything or will I get paid to participate?
Who gets to see my information?
Do I need to be in the hospital?
The informed consent potentially contains the answers to most questions a participant has.