Product liability refers to the product supplier (including the manufacturing) Liability for civil damages, such as buyers, sellers, repairers, etc. ). According to the above definition, Which of the following situations clearly belong to the product supplier:. ['Pedestrian injuries caused by the collapse of a viaduct due to the use of substandard steel bars.', 'Patients without an allergic skin test die after penicillin injection.', 'Citizens are not refrigerated after purchasing yogurt, and are hospitalized after drinking.', 'A baby takes adult vitamins by mistake and causes acute poisoning.']