Sentence 1: Studies of the translation of efficacious research practice into clinical practice is needed most since screening instruments have been used by research staff and not clinical staff.

Sentence 2: Most screening items have been used by clinical staff but not research staff.
pick from the following.
[A]. yes.
[B]. it is not possible to tell.
[C]. no.
Is this second sentence entailed by the first sentence?
[C].