A common sign of carbon monoxide poisoning is cherry red skin

Which of the following substances were the mainstay of anesthetics for several centuries?

A) nitrous oxide and acetaminophen B) opiates and alcohol C) halothane and alcohol D) opiates and aspirin

A ________ test is used to measure the amount of nitrogen in the blood, indicating renal function.

A. blood urea nitrogen B. thyroxine C. uric acid D. creatinine