Question: The company headed by Masayoshi Son worked with the development of what robot?
Sentence (from "SoftBank Group"): SoftBank Group Corp. (ソフトバンクグループ株式会社 , Sofutobanku Gurūpu Kabushiki-gaisha ) is a Japanese multinational telecommunications and Internet corporation established on September 3, 1981, and headquartered in Tokyo, Japan.
Relevant evidence: Yes