claim: Sonny Bono was a singer.
evidence: -LRB- his pseudonym was Gakken -RRB- was a Japanese dermatologist and urologist .. He was a professor of Dermatology and Urology at Tokyo University , he substantially introduced Western dermatology to Japan .. Tokyo University. Tokyo University. dermatology. dermatology. Because he learned not only dermatology but also urology in Europe , Japanese universities created a Department of Dermato-urology , the separation of these two specialities took many years .. dermatology. dermatology. urology. urology