Alexander thought for a while about how to answer.
And ultimately decided to answer frankly.
This thing would be ultimately very hard to conceal, so he saw little point in hiding.
While also there was the fact that Alexander had plans to bring up a collaboration between Pasha Farzah, Lady Inayah, and him using this material.
So they would get to know about it sooner or later.
"This is called cement. It is a new type of mortar we found in Zanzan," He breezily answered, and then explained, "The engineers found that the stuff easily binds with stone. And so we decided to use it to make roads."
Alexander said the whole thing so lightly that he was seemingly not putting too much importance on the invention.
And the other members' curiosity also died down quite a bit hearing that, as they also had mortals of their own.
Though comparing their mortar to Alexander's would be like comparing a horse carriage to a supercar.