LSD is a synthetic/fungal-derived hallucinogen.

Explanation

### Step-by-Step Text Solution:

1. **Understanding LSD**: LSD stands for Lysergic Acid Diethylamide. It is a well-known hallucinogenic substance that alters perception, mood, and various cognitive processes.

2. **Source of LSD**: LSD can be derived from two main sources: it can be synthesized in a laboratory or obtained from a natural source, specifically a fungus.

3. **Fungal Origin**: The natural source of LSD is the fungus Claviceps purpurea, which is known for producing ergot. Ergot is a type of fungus that grows on rye and other grains.

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