A: I believe it is the only solution to this problem.
B: That's debatable, I think. I can come up with five other solutions as good as that.
A: Do you really think so? If you take everything into consideration, you will see that mine is the only choice.
B: Then, why don't you explain it in detail?

A: 我相信它是解决这个问题的唯一对策。
B: 我想这种说法大有问题。我可以想出其它五种同样好的对策。
A: 你真的以为如此吗？如果你通盘考虑，就知道我的对策是唯一的选择。
B: 那么，你何不详细说明一下？

重点解说：

★ solution to ~（~的对策，~的解决方法）reach [arrive at, come to] a solution（获得解决之道）

★ That's debatable.（这种说法大有问题。）此语用于表示某事仍属未定、尚有争议或还有问题存在。类似的说法还有"That's not convincing."（这无法让人信服。）或"I'm not convinced."（我无法采信。」

★ Come up with“想出(对策、计划、主意等)”

★ take ~ into consideration（考虑~），consideration一词也可用account代替。

★ only choice（唯一的选择）

★ in detail（详细地）如： detailed explanation（详细的说明）