Which of the following is the most potent preparation of marijuana?

Charas is considered the most potent preparation of marijuana due to its method of production and concentration of THC (tetrahydrocannabinol), the psychoactive compound in cannabis. Charas is made by hand-rolling and collecting the resin from live cannabis plants, which results in a product that contains a high concentration of cannabinoids. This traditional method often leads to higher potency compared to other forms of cannabis.

Other preparations, like hashish, while also potent, are produced from dried cannabis plants and may have a slightly lower concentration of THC compared to charas. Ganja typically refers to the flowers of the cannabis plant, and while it can be potent, its THC concentration is generally less than that found in charas. Kief, which consists of the trichomes sifted from cannabis flowers, also has a high potency but again usually does not reach the level of concentration found in charas.

Thus, charas stands out as the most potent form due to its unique production process and resultant THC content.