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 "Deng Fa"): He was born in Yuncheng District, Yunfu, Guangdong, and participated in the Canton–Hong Kong strike and the Guangzhou Uprising in his youth.
Relevant evidence: No