With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The theory describing cells was first developed in the 19th century.
text_B: Edoardo Garbin -LRB- 12 March 1865 -- 12 April 1943 -RRB- was an Italian operatic tenor .. He was married to the soprano Adelina Stehle .. Adelina Stehle. Adelina Stehle. One of the most important Italian tenors of his day , Garbin created , inter alia , tenor roles in Franchetti 's Cristoforo Columbo , Fenton in Verdi 's last opera Falstaff -LRB- 1893 -RRB- , and Milio in Leoncavallo 's Zaza ; in 1917 , in Rome , he appeared in the world premiere of Renzo Bianchi 's Gismonda alongside Ida Quaiatti and Domenico Viglione Borghese .. Renzo Bianchi. Renzo Bianchi. Ida Quaiatti. Ida Quaiatti. Domenico Viglione Borghese. Domenico Viglione Borghese. His success in Anglo-Saxon countries -LRB- such as England -RRB- was -LRB- put charitably -RRB- limited -LRB- he was , by The Times , described as `` miserable '' as Cavaradossi at Covent Garden in 1908 -RRB- ; but in the Latin sphere -LRB- South America and Italy -RRB- he was in constant demand until his retirement in 1918 .. He recorded for G&T -LRB- to become HMV -RRB- in 1903 , Fonotipia and Columbia ; his recordings for the two last mentioned companies sold very well , and are easily found .. According to Scott -LRB- Record of Singing 1978 -RRB- his best record of all is the E un riso gentil from Leoncavallo 's Zaza .. Garbin represents a `` half-way-house '' between the older bel canto school and the new verist style .. Garbin 's style -LRB- according to Steane -- The Grand Tradition 1971 -RRB- is a curious mix of the frail and explosive .. At his death , in 1943 , Edoardo Garbin was the last male solo vocal artist to have created a part and worked with Giuseppe Verdi -- some fifty years ' previously in the composer 's Fastaff of 1893 .. Giuseppe Verdi. Giuseppe Verdi. It was a role he had repeated in 1913 at La Scala at the Verdi Centenary Celebrations .
not_related.