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Constant term in the expansion of (x-1/x...

Constant term in the expansion of `(x-1/x)^(10)` is a. `152` b. `-152` c. `-252` d. 252

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Suppose `(r+1)` th termn the given expansion.
Then, we have:
`T_{r+1}=\ ^{10} C_{r}(x)^{10-r}(frac{-1}{x})^{r} `
`=\ ^{10} C_{r}(-1)^{r} x^{10-r-r}`
...
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