<human>: Does the sentence "It is also central to the Unspunnenfest, first held in 1805, with its symbol the 83.5 kg stone named Unspunnenstein." provide a valid answer to the question "What was the name of the 83.5 kg stone that symbolized the Unspunnenfest, first held in 1805?"
OPTIONS:
- yes
- no
<bot>: yes