Which code would indicate a request for ice to chill medicine?

The code that indicates a request for ice to chill medicine is REFG. This code is specifically designated for requests related to refrigeration needs, which includes ice for medical purposes. In the context of passenger services, this is important because keeping certain medications at a controlled temperature is essential for their effectiveness and safety.

The other options represent different services or items: SEAT refers to seating arrangements, SMLS often relates to meal service or similar requests, and OXYG pertains to oxygen-related services. These codes are distinct, aligning with specific needs or requests, making REFG the appropriate choice for indicating a request for ice to preserve medicine.