Final answer:
The nurse would ask a client scheduled for a venogram about allergy to iodine before the procedure.
Step-by-step explanation:
The nurse would ask a client scheduled for a venogram about allergy to iodine before the procedure. Iodine is commonly used as a contrast agent in venography to enhance blood vessels, and it is important to ensure that the client does not have an allergy to it. Asking about allergies to peanuts, eggs, or meat tenderizer is not relevant for a venogram procedure.