Definition: You are given a sentence and a question in the input. If the information provided in the sentence is enough to answer the question, label "Yes", otherwise label "No". Do not use any facts other than those provided in the sentence while labeling "Yes" or "No". There are only two types of valid responses: Yes and No.
Input: Sentence: According to Swayambhu Purana, present-day Kathmandu was once a huge and deep lake names Nagdaha as it was full of snakes. 
Question: According to legend, what body of water once existed on the site of Kathmandu?

Yes.