You are given a sentence and a question in the input. The information provided in the sentence should be enough to answer the question. You're expected to write the correct answer. Do not use any facts other than those provided in the sentence.

Sentence: Most of the fairs and festivals in Kathmandu originated in the Malla period or earlier.
Question: To what era do a majority of Kathmandu's festivals date back to?
Malla period.