_______ is responsible for security accommodations and services

_______ is responsible for security accommodations and services in the House of Lords' part of the Palace  of Westminster.
A、The Lord Chancellor
B、The Gentleman Usher of the Black Rod
C、The Speaker
D、The Clerk of the Parliaments
【正确答案】：B
【题目解析】：黑杖绅士引座员负责威斯敏斯特宫上议院的安全设施和服务。