Single/multi-select question: 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:
(1). yes
(2). no
(1).