Correct Answer: (a) Michael Phelps
Solution:The famous swimmer Michael Phelps, better known as the 'Golden Shark', is an American swimmer. He has won a total of 28 medals (23 Gold, 3 Silver, 2 Bronze) in the Olympic Games. He retired in the year 2016. Phelps also holds the record for winning the most gold medals (8) in any single Olympics (Beijing Olympics-2008).