A lot number can help identify which of the following?

A lot number is a unique identifier assigned to a specific batch or production run of a pharmaceutical product and is crucial for tracking and quality control purposes. This number allows for the precise identification of a specific portion of a batch, which can be essential during recalls or investigations related to safety or efficacy issues. By tracing a lot number, pharmacies and manufacturers can determine the exact quantity of a medication that may be affected, thus ensuring patient safety.

The other options, while related to pharmaceuticals, do not align with the primary function of a lot number. For instance, the National Drug Code (NDC) is a specific identifier for medications but is not tied to the production batch. Drug classes categorize medications based on their chemical composition or therapeutic use, unrelated to any individual batch characteristics. Manufacturers are identified by their company name or unique identifiers distinct from lot numbers. Thus, the significance of a lot number lies firmly in its ability to pinpoint a specific subset of products from a larger batch, ensuring quality control and regulatory compliance.