## Core Concept
Ganja, also known as marijuana, is a psychoactive drug derived from the *Cannabis* plant. The primary active principle in *Cannabis* is **tetrahydrocannabinol (THC)**, which is responsible for its psychoactive effects. The concentration of THC can vary significantly depending on the source and preparation of the drug.

## Why the Correct Answer is Right
The correct answer, , indicates that the percentage of THC in Ganja is approximately 5-8%. This range is generally accepted in the context of cannabis potency. THC levels can vary based on factors like the strain of the plant, growing conditions, and the part of the plant used. However, 5-8% THC is a commonly cited range for Ganja.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is incorrect because 20-30% THC is unusually high for typical Ganja and more representative of highly potent cannabis extracts or concentrates.
* **Option B:** - This option suggests a range that is too low (less than 1%) and does not accurately reflect the psychoactive potency typically associated with Ganja.
* **Option D:** - This option, suggesting a much higher percentage (more than 30%), is not representative of standard Ganja preparations.

## Clinical Pearl / High-Yield Fact
A key point to remember is that while THC levels in cannabis products can vary widely, traditional Ganja typically contains around 5-8% THC. However, modern cannabis strains and preparations can have much higher concentrations, making potency a critical consideration for both medical use and recreational use.

## Correct Answer: .