Except as provided in subsection (b) of this section, a licensed premises shall end all operations, including the serving of alcoholic beverages and food and providing entertainment, at the closing hour for that class of licensed premises specified in this title. The Board may grant an exemption for remaining open after hours to: a holder of a Class B restaurant license, only for serving food to patrons seated for dining; a pharmacy that fills prescriptions; or a holder of a Class D beer, wine, and liquor license that operates a restaurant, if: it is used only for serving food to patrons seated in a dining room that is not adjacent to a bar; and the restaurant is located in the 46th legislative district in the Legislative Districting Plan of 2022. A pharmacy that receives an exemption under paragraph (1) of this subsection may also sell products other than alcohol after normal closing hours. A hotel that holds a Class B license and that serves food to seated customers or for private functions or guest rooms may continue to provide food service. The Board may waive the requirement in paragraph (1)(iii)1 of this subsection that a dining room not be adjacent to a bar.