Michael Phelps, the legendary swimmer, is set to return to competitive swimming at the U.S. Grand Prix in Arizona. After retiring post-2012 London Olympics with a record 18 gold medals, Phelps aims to focus on relays and short distances. His coach suggests he will concentrate on the 100m butterfly and freestyle. Phelps, now 28, rejoined the anti-doping program earlier this year, possibly eyeing the 2016 Rio Olympics.

Where is Michael Phelps planning to make his competitive return?

• U.S. Grand Prix in Arizona

• World Championships in London

• Olympic Trials in Beijing

• European Championships in Paris

How many gold medals did Phelps win at the 2008 Beijing Olympics?

• Six

• Seven

• Eight

• Nine

What events is Phelps likely to focus on according to his coach?

• Diving and synchronized swimming

• Long-distance freestyle

• Relays and short distances

• Backstroke and breaststroke

At what age did Phelps rejoin the anti-doping program?

• 27

• 29

• 26

• 28

What is Phelps' potential goal after rejoining the anti-doping program?

• Compete in the 2016 Rio Olympics

• Start a swimming academy

• Retire permanently

• Become a coach