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The correct choice is roller latches. According to CMS (Centers for Medicare & Medicaid Services) standards, the use of roller latches on doors that contain flammable materials presents a safety concern because these latches may not provide a secure enough closure to prevent the spread of fire or smoke in the event of an emergency. Roller latches are often less reliable in maintaining a tight seal compared to other mechanisms, which could compromise fire safety measures designed to protect against the rapid spread of fire within a facility.

In healthcare environments, ensuring that fire safety features are effective is critical. For example, magnetic locks, while they can be used where flammable materials are present, typically have fail-safe designs that allow for quick disengagement during emergencies. Spring hinges help maintain doors in a closed position to provide better containment of smoke and fire. Double locking mechanisms can offer enhanced security, which might be preferable depending on the circumstances, but they can also be designed to facilitate easy opening in emergencies.

The focus on fire safety standards under CMS emphasizes the importance of appropriate locking mechanisms that adequately restrict access to flammable materials while also ensuring they can be opened swiftly in emergencies. Thus, roller latches do not meet the necessary requirements in this context.