**Core Concept**
Human viruses require living host cells to replicate and cannot grow in artificial media. Viral growth depends on the presence of specific cellular machinery such as ribosomes, nucleotides, and enzymes, which are absent in non-living environments.

**Why the Correct Answer is Right**
Enriched media, though sometimes used to support bacterial growth, lack the necessary host cells for viral replication. Viruses are obligate intracellular parasites and must infect living cells to multiply. In contrast, continuous cell lines (like Vero or HEK293), suckling mice, and embryonated eggs provide living host environments where human viruses can replicate. Enriched media cannot support viral growth due to the absence of host cell machinery.

**Why Each Wrong Option is Incorrect**
Option A: Continuous cell lines (e.g., Vero cells) are widely used for growing human viruses like poliovirus and influenza, providing a stable, permissive environment for viral replication.
Option B: Suckling mice are used to grow viruses such as rabies and measles, as their immune systems are immature and susceptible to infection.
Option C: Embryonated eggs are a classic system for growing viruses like influenza and polio, offering a living, developing host environment.

**Clinical Pearl / High-Yield Fact**
No artificial medium can support viral replication—only living host cells can provide the necessary intracellular environment. This is a fundamental principle in virology and distinguishes viruses from bacteria.

✓ Correct Answer: D. Enriched media