delta - Implied volatility interview question

If an implied volatility of an out of the money call option goes to infinity,what happens to the delta of the said call option?

Answer

The Black-Scholes delta:

$$\partial_SC=N\left(\dfrac{\ln\left(\frac{S_0}{K}\right) +(r - q + \frac{1}{2}\sigma^2)(T - t)}{\sigma\sqrt{T - t}}\right)$$ As you can see this delta would go to$1$ if $\sigma\to\infty$ (and $t