Which is wrong about facial vein?

A、The triangulation area from nasion to bilateral corners of the mouth is named as dangerous triangle.;

B、Facial vein has no venous valve.;

C、In situation of facial infection, extrusion is suggested to conduct.;

D、Facial vein begins from angular vein.;

E、Facial vein communicates with pterygoid venous plexus via deep facial vein.