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"): There are pipes to the reservoir and down to Chestnut Hill, and gates for controlling access to local the distribution network.
Relevant evidence: No