Man pages matching name xmvacreatesimpleoptionmenu in section 3:

XmVaCreateSimpleOptionMenu.3.en	debian 10 / libmotif-dev
XmVaCreateSimpleOptionMenu.3.en	debian 11 / libmotif-dev
XmVaCreateSimpleOptionMenu.3.en	debian 12 / libmotif-dev