Question: The A1159 road is a short road, skirting the north of Southend-on-Sea from Prittlewell to Southchurch, in Essex, a county in the East of England immediately north-east of London, and is one of the home counties, the county town is what, which is the only city in the county? 
Sentence (from "Essex"): The county town is Chelmsford, which is the only city in the county.
Relevant evidence: Yes