Suppose Beethoven's Symphony No. 9 in D minor, Op. 125 is a choral symphony composed by Beethoven in 1824. It is one of the best-known works in the Western classical repertoire. Beethoven's Ninth Symphony is a life-affirming work that many see as a great testament to the human spirit. 
Can we infer that "Beethoven's Symphony No. 9 is a purely instrumental piece."?