The correct option is
A Heroin
Diacetyl morphine is the name for heroin, a semisynthetic opiate. It is formed from acetylation of morphine, a natural opiate. Opiates are derived from opium, the dried latex of unripen capsular fruits of poppy plant Papaver somniferum. Heroin is also known as H-smack or Brown sugar. It is a white and odourless crystalline compound having a bitter taste. It is three times more potent than morphine.
So, the correct answer is 'Heroin'.