As Jimi Oke factors out, it would not make any difference what letter the term begins with, but what sound it commences with. Given that "standard" begins having a 'y' seem, it should really choose 'a' instead of 'an'. The Arabian Gulf and North Africa mix heritage with modernity, so https://petskyonline.com/blog/why-tofu-cat-litter-is-gaining-popularity-in-the-uae/