More details ? , but there are some basic questions you can ask , like , Are there any GMOs in the food or How is the product made , Is the product made naturally or by man, Hand made or made by machinery.
Factors that could hamper effective communication would be staying in the past, talking only about one aspect of the situation, not being prepared to think about a situation in a new light, not considering all the possibilities which might help in a current situation, and many others. These were just five ones which are highly harmful when one wants to be effective in communication.
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I think 3. U must be as detailed as possible so the nurse can tell u what u need to hear, she or he might call someone over to answer your questions