Question: The Fisher Hill Reservoir and Gatehouse are a historic element of the public water supply for which metropolitan region of New England encompassing the municipality of Boston, the capital of the US state of Massachusetts, and the most populous city in New England, as well as its surrounding areas? 
Sentence (from "Fisher Hill Reservoir"): The reservoir was located on Fisher Road between Hyslop and Channing Roads in Brookline, Massachusetts, and is now the site of Fisher Hill Reservoir Park.
Relevant evidence: No