Jharkhand PSC Prelim Exam 2006 Solved Paper

(1) A xenobiotic is a foreign chemical substance found within an organism that is not normally naturally produced by or expected to be present within. It can also cover substances that are present in much higher concentrations than are usual. Specifically,drugs such as antibiotics are xenobiotics in humans because the human body does not produce them itself, nor are they part of a normal food.