<prompt> The highest incidence of Gestational Tropho-blastic Disease is in:AustraliaAsiaNorth AmericaWestern Europe  <response>: Incidence of gestational trophoblastic disease varies widely with figures as high as 1 in 120 in some areas of Asia and South America, compared to 1 in 1200 in the united states.Devita 7e, p 1360 