Is it possible to create a Column with Conditional Mandatory with another Column?

Is it possible to create a Column with Conditional Mandatory with another Column?
For example
In a Table we have column A, B, C.
A is Primary Column.
B is Optional
C is Conditional Mandatory.
A B
C
12345 ABC
OK
12346 NULL
NULL
12347 ABC
OK
Only if the B Column has the value then only C column should be mandatory

I guess you can't create a condtional mandatory column directly. However, you can use check constraint to on the column
create table YourTable
A int primary key,
B char(3),
C int,
constraint ch_con check(
B
is not null
or C is null

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