Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: It's the most widely used illegal drug in the world, but does cannabis deserve its reputation as being one of the safest? Not if you take a look at South Africa, one of the UK's biggest providers of high-strength cannabis, where a potent strain of the plant dubbed 'swazi gold' is wrecking havoc on its young population. As revealed in BBC's Stacey Dooley Investigates, which aired last night, poverty-stricken grandmothers are growing it, drug mules are risking their lives to smuggle it out of the country, and what stays behind is ruining the lives of South Africa's drug-addled teens. Scroll down for videoThe strain is grown in Swaziland, one of South Africa's poorest statesIt has extremely high concentrations of THCSouth African teens blend it with heroin to produce potent cocktail 
 Question:Lucrative: Farmers in _ developed the potent strain through cross-pollination, and can now yield double the crop they once could annually (file photo).

Swaziland