Which office is responsible for the state's financial advisory services in Illinois?

The Comptroller's office is responsible for managing the state's financial advisory services in Illinois. This role includes overseeing the state's accounting systems, managing the budget, and ensuring that the state's financial operations run smoothly. The Comptroller also reviews and approves all claims against the state, making it a crucial position for maintaining financial integrity and accountability.

Unlike the Treasurer, who focuses more on the investment and management of state funds, or the Secretary of State, who handles various administrative functions including business registrations and vehicle licensing, the Comptroller specifically handles the fiscal responsibilities of the state. The Attorney General's office typically deals with legal matters and does not have a direct role in financial advisory services. Therefore, the Comptroller is correctly identified as the office tasked with overseeing the financial advisory services for the state of Illinois.