Unsetting a DHCP option in dhcpd.conf(5)

Hi,

can an option be unset in a host declaration of dhcpd.conf(5)?

I'm trying to set a generic "option routers A.B.C.D" option in a
subnet block and disable it in some host blocks.

I've already skimmed through dhcpd.conf(5) and dhcp-options(5) man
pages, to no avail.