brother there is a difference between Alkali Metals and Alkali. I have given you the link to wikipedia in one of the previous posts. Please consult that. Agur phir bhi dil ko nai par rahee yeh baat sahe tou i am saying na k consider your mcq correct
I also gave you the link to a book where Slaked Lime is mentioned as an example of Alkali. That was a Chemistry book.
and agur scientific baat hay tou: Ca is an alkaline Earth Metal but when it combines with hydroxyl group, it forms a base or interchangeably an alkali
