Screening Tenants

[Jimmy NA]

Can a landlord ask a prospective tenant the follow question without violating a Fair Housing law.
"How many people do you have in your group?"
And can a landlord deny tenancy if he/she thinks there are too many people in the potential tenants "group" (ie family, or what ever you want to cal it.)
For example, you have a small 5 room apt. and a "family" of 5 or 6 or 7 people want to rent?