Disable root hint lookup

I have disabled Recursion on my DNS server, but now when doing a "nslookup google.com xxx.xxx.xxx.xxx" still get something like this with corresponding IP Addresses

.       nameserver = A.ROOT-SERVERS.NET.
.       nameserver = B.ROOT-SERVERS.NET.

.       nameserver = C.ROOT-SERVERS.NET.

.       nameserver = D.ROOT-SERVERS.NET.

.       nameserver = E.ROOT-SERVERS.NET.

.       nameserver = F.ROOT-SERVERS.NET.

Can anyone tell me how I can prevent this from happening and instead get a "refused" response from my server instead? It would be the equivalent of

 "additional-from-cache no;" in a Bind environment

thanks