Question: In the Sherlock Holmes book 'The Sign of Four', what is the 7% solution?
Answer: Cocaine trade; Coke (drug); ATCvet code QS02DA02; Crack+cocaine; Freebase cocaine; Kilogram of cocaine; Benzoylmethylecgonine; Powdered cocaine; Llello; Methylbenzoylecgonine; ATC code S02DA02; Crackpipe; Crack overdose; Nose Candy; Cocaine HCl; Ye yo; Methyl benzoylecgonine; ATC code S01HA01; Cocoaine; Cocaine trafficking; Benzoyl methyl ecgonine; Nose candy; ATCvet code QN01BC01; ATC code N01BC01; Gaggas; Cocain; Crack heads; Bolivian marching powder; ATC code R02AD03; Synthetic cocaine; Prohibition of cocaine in the United States; Cocaine Abuse; Erythroxyline; Yeyo; Cocaine hydrochloride; Cocaine-related disorders; ATCvet code QR02AD03; Effects of cocaine; Columbian marching powder; Cocaine; Cocaine hydro-chloride; Farlopa; ATCvet code QS01HA01