"Phở truyền thống."
If it is simply the noun phrase "traditional pho," it should not be followed by a period. If it is followed by a period, it should be a sentence which this could be, right?
Correct. It was there by accident. Now it is very tricky and annoying to remove that period in original sentence, and since the system requires matched punctuation, the answer must contain a period too.
authentic means more like chính thống, nguyên gốc though truyền thống is acceptable
Earlier lessons translated Phở as noodle soup. Now it's just noodles, I was marked wrong for noodle soup!