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Currently sanitary products are taxed at five per cent - while items such as flapjacks have a zero per cent VAT rate.
Laura Coryton, the 21-year-old who started the Change.org petition, wants Osborne to back the campaign and take it to the European parliament as Britain cannot exclude an item from VAT unilaterally.
According to the government's own terminology, a person will pay 20 per cent VAT most of the time "but less on essential items".
Does that mean the chancellor believes all the below things - taxed at zero per cent or exempt altogether - are more essential than tampons?
(Zero per cent)