Defect liability guarantee refers to that according to the law, when one party transfers property (or right) to the other party in a transaction, the property (or right) should be guaranteed to be free of defects. If the transferred property (or right) is defective, it should be Take corresponding responsibilities to the other party. According to the above definition, among the following options, Company B does not need to assume the liability for a flawless guarantee:. ['Company A purchased four stainless steel water tanks from Company B. The latter tank burst. It was identified that the thickness of the steel plate of the water tank was thin and the welding quality was poor, which did not meet the requirements of national standards.', 'Company A and Company B signed an agreement. Company A paid 500,000 yuan to obtain 6 patented products of Company B. After the use of Company A. it was found that the copyright of one of the products belonged to Company C.', "Company A and Company B signed an `` Equity Transfer Agreement '', which agreed that Company A would transfer the entire shareholding in its name to Company B. Shortly after the agreement was signed, Company B had a problem with its funds and applied for bankruptcy.", 'Company A leased the factory building of Company B to set up a chemical plant. After the house leaked, Company A arranged for worker Yang to replace the asbestos tiles on the roof. As a result, Yang suffered a sudden break from the height of the house and was injured during the replacement process.']