A 29-year-old woman with opioid use disorder injecting heroin daily wishes to start treatment. She is not pregnant and has no significant comorbidities. According to Canadian guidance, what is the most appropriate first-line pharmacologic option?AOral naltrexone as first-lineBBuprenorphine naloxone under supervisionCDetoxification without maintenance therapyDMethadone only if buprenorphine fails, but avoid ORT if possibleENo pharmacologic treatment; counselling onlyCheck my answer