Is there a way to limit user access based on a specific drop down option within a field? Or just the field itself?

We have a particular field and we only want certain users to have access to those leads that have a specific option marked in that particular field. Any way to accomplish this? In Role Management I'm only seeing options to block users from the entire field, not within a choice in a field. For instance if we have Lead Source as a field with drop down options A, B, C and D. I want to be able to create a role where any user assigned to that role ONLY has access to leads marked with option C chosen in that particular field. Any help is greatly appreciated. 

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