You will be given a definition of a task first, then some input of the task.
In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Question: Did Ito or Millman start playing professional tennis first? Passage:In men's singles, on the opening day, play began with the defending champion and world no. 1, Novak Djokovic, dismantling Frenchman Paul-Henri Mathieu. The other top seeds cruised through with 4th-seed David Ferrer winning over Olivier Rochus and 5th-seed Tomas Berdych over Michael Russell. Last year's quarterfinalist Kei Nishikori also came through over Victor Hanescu. Former finalist Marcos Baghdatis struggled to get past Spaniard Albert Ramos, winning in five sets; another seed in Fernando Verdasco, who was a former semifinalist, was also pushed to his limits, winning in 5 over David Goffin. All other seeds came through with the exception of 11th seed Juan Monaco who lost to Andrey Kuznetsov after suffering from a back injury. The Australians didn't have a good day with all three that competed in the day losing. The first of which was Matthew Ebden falling to 23rd seed Mikhail Youzhny despite leading 2 sets to 0. His exit was followed by Australian wildcard John Millman who fell also in five to Tatsuma Ito. In the final men's match of the day, 8th seed Janko Tipsarevic defeated former world no. 1 Lleyton Hewitt in three tight sets.
Links: a. David Goffin b. Tatsuma Ito c. Fernando Verdasco d. Marcos Baghdatis
Output:
b