Which of these statements is incorrect? Group of answer choices We can only consider relative safety because absolute safety is impossible to be achieved. Some xenobiotics can induce the expression of enzymes that metabolize themselves. Certain safety factor is LD1/ED99. So a smaller certain safety factor means the drug is safer. We base on three aspects to evaluate the risk: the property of hazards, dose-response assessment and exposure assessment. Chemical manufacturers are responsible to perform tastings to ensure the toxicity of their products