Which insulin type is available over-the-counter (OTC)?

Novolin N is the correct choice because it is one of a few types of insulin that are available over-the-counter (OTC) in many locations. This type of insulin is an intermediate-acting insulin that is commonly used to control blood glucose levels in people with diabetes. Since it does not require a prescription in many places, patients can easily access it for their diabetes management.

In contrast, other types of insulin, such as Lantus, Levemir, and Glargine, typically require a prescription. These insulins are often long-acting or ultra-long-acting and are specifically tailored for certain patient needs and management strategies that necessitate clinical oversight. The availability of Novolin N OTC provides a simpler option for some individuals who need to manage their diabetes without the barrier of obtaining a prescription.