Question: The company headed by Masayoshi Son worked with the development of what robot?
Sentence (from "Masayoshi Son"): Masayoshi Son (Japanese: 孫 正義 , Hepburn: Son Masayoshi , Korean: 손정의 "Son Jeong-ui"; born August 11, 1957) is a Korean-descendant (Zainichi Korean) Japanese businessman and the founder and current chief executive officer of SoftBank, the chief executive officer of SoftBank Mobile, and current chairman of Sprint Corporation.
Relevant evidence: No