Which medical kit is available first for licensed medical professionals on board?

The First Response Kit is the correct choice as the medical kit available first for licensed medical professionals on board. This kit is designed to provide immediate assistance for medical emergencies that may arise during a flight. It contains essential supplies and equipment that allow trained personnel to address basic medical needs until further help can be arranged upon landing or until more advanced medical care can be provided.

The other kits, while they serve important purposes, are not typically the first available option for licensed medical professionals. The First Aid Kit generally contains items for minor injuries and common ailments, which might not cater to the needs of situations requiring professional medical intervention. The Advanced Care Kit and Emergency Medical Kit contain more comprehensive supplies and equipment but are used in conjunction with or after the initial response addressed by the First Response Kit. Thus, the First Response Kit is prioritized to enable quick action during a medical emergency.