Which of the following is a mandatory member of the Medical Examiner Commission?

The correct answer is a County Commissioner, as this position is mandated to be a member of the Medical Examiner Commission in Florida. The Medical Examiner Commission oversees the medical examiner system in the state, ensuring it operates effectively and in accordance with legal standards. The inclusion of a county commissioner is essential as they can provide valuable insights related to local governance and budgetary considerations that directly affect the medical examiner's office and its operations.

The other roles, while important in different contexts, do not hold mandatory positions on the Medical Examiner Commission. Funeral directors, public defenders, and the Secretary of Health, although they may provide important perspectives or services related to death investigations or public health, are not specified as required members according to Florida law. This distinction highlights the unique roles that various officials play in the regulation of public safety and health within the community.