The following are multiple choice questions (with answers) about medical knowledge.   **Question:** A 24-year-old man is brought to the emergency department by the police. He was found unconscious and covered in bruises outside of a local bar. The patient has a past medical history of polysubstance abuse, depression, multiple suicide attempts, neuropathic pain, and schizophrenia. As part of the patient’s initial workup, a head CT is performed which is unremarkable, and an arterial blood gas is performed as seen below:  pH: 7.29 PaCO2: 95 mm Hg PaO2: 70 mm Hg Bicarbonate: 24 mEq/L  Which of the following is the most likely etiology of this patient’s current presentation?   (A) Amitriptyline   (B) Cocaine   (C) Ethylene glycol   (D) Heroin
['(D) Heroin <> answer', 'The following are multiple choice questions (with answers) about medical knowledge. <> instruction', '(A) Amitriptyline \n (B) Cocaine \n (C) Ethylene glycol \n (D) Heroin <> possible answers', '  A 24-year-old man is brought to the emergency department by the police. He was found unconscious and covered in bruises outside of a local bar. The patient has a past medical history of polysubstance abuse, depression, multiple suicide attempts, neuropathic pain, and schizophrenia. As part of the patient’s initial workup, a head CT is performed which is unremarkable, and an arterial blood gas is performed as seen below:\n\npH: 7.29\nPaCO2: 95 mm Hg\nPaO2: 70 mm Hg\nBicarbonate: 24 mEq/L\n\nWhich of the following is the most likely etiology of this patient’s current presentation? <> context@']