Final answer:
The EPA requires real estate professionals to provide a pamphlet about Lead-Based paint if the dwelling was built before 1978.
Step-by-step explanation:
The EPA requires real estate professionals to give purchasers and tenants of residential dwelling a pamphlet about Lead-Based paint if the dwelling was built before 1978. According to the information provided, lead-based paint was banned by the U.S. government for use in housing in 1978. Therefore, any residential dwelling built before that year may potentially have lead-based paint, making it necessary for real estate professionals to provide the pamphlet to inform potential buyers and tenants about the potential risks of lead exposure.