2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/77630We answer a recent question of Pyrih by proving that a topological space $(X,τ)$ is open-normal if and only if it is extremally disconnected.2 pages, to appear in "Questions and Answrs in General Topology"General Topology54G05; 54G99; 54H05text