The research was carried out by doctors to “identify the best accompanying biscuit for nutritional content, crunchiness, and integrity when dunking”, alongside determining the “time required to achieve optimal palatability of a cup of tea without risk of harm (oral scalding)”.
Article source: https://www.huffingtonpost.co.uk/entry/best-biscuit-for-tea-dunking_uk_63a30cfbe4b0aeb2ace95bb8