Lyophilization (freeze-drying) is used in pharmaceutical industry to:

Explanation

Lyophilization, or freeze-drying, works by freezing the product and then placing it under vacuum so that water is removed from the frozen state. The FDA describes the process as freezing followed by primary drying and secondary drying, with the major portion of water reduced through sublimation and desorption. This is useful for pharmaceutical products that are unstable in solution because a dry product is generally more stable and can be dissolved again before use. That is why the option about preserving vaccines and biologics by removing water at low temperature best matches the process. The storage point still matters: lyophilization can improve shelf life and reduce ultra-cold-chain dependence for some products, but each product must follow the manufacturer's specified cold-chain requirements.

Why the other options are wrong

• (B) Making tablets is not the purpose tested here; the cited FDA discussion treats lyophilization as a freeze-drying process for products such as parenteral and biotechnology-derived products, not as tablet manufacture.
• (C) Packaging is only a handling or container step around a medicine, whereas lyophilization specifically removes water from a frozen product under vacuum to produce a dry, more stable form.
• (D) Sterilisation may be a separate control step in sterile pharmaceutical processing, but lyophilization itself is the freeze-drying step, not equipment sterilisation.

Concept

This tests pharmaceutical processing under Science and Technology: how freeze-drying improves stability of sensitive biological products. RAS repeats such questions because they connect basic phase-change science with practical public-health and drug-storage applications.

Source

• U.S. Food and Drug Administration

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