Given the following reasoning and answer, what was the question? If he draws any combination of 3 socks he will definitely have the matching pair of either colour.
 The answer: (A)

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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The question John has 10pairs of dark blue socks and 10pairs of black socks. He keeps them all in the same bag. If he picks out 3socks at random, then what is the probability thathe will get a matching pair?
Options:
(A) 1
(B) 3
(C) 4
(D) 5
(E) 6