Notwithstanding any other law to the contrary, any employee of a city of the first class, city of the second class, or incorporated town, and any elected official of a city of the first class, city of the second class, or incorporated town who is entitled by an act of the General Assembly to retirement benefits for service as such an employee or elected official and who also participates in another retirement plan established by the city for the same period of service shall be entitled to only one (1) retirement benefit for the same period of service to the municipality, provided that no elected official may withdraw in a lump sum or roll over into a private account any accumulated benefits established by the municipality for which the official was employed and at the same time receive a pension as provided for under an act of the General Assembly, and the employee or elected official may choose whether to receive the retirement benefit provided by law or provided by the plan offered by the municipality.