Question: What is the police force who uses the Mercedes-Benz Sprinter police van and is also the largest disciplined service under the Security Bureau of Hong Kong formed on 1 May 1844?
Sentence (from "Police vehicles in Hong Kong"): One of the most commonly seen police vehicles in Hong Kong is the Mercedes-Benz Sprinter police van, which is mostly used by district stations and the Emergency Unit, one of the roles expected of it is rapid response to 999 emergency calls with regards to road safety and public safety.
Relevant evidence: Yes