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The Securities and Exchange Commission has asked John J. Mack , the chief executive of Morgan Stanley , to testify in its insider-trading investigation of a prominent hedge fund , reversing a decision that is at the center of several government inquiries into the agency 's handling of the case .
 John J. Mack, Morgan Stanley
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
Answer:
 John J. Mack, Morgan Stanley