A CONDITIONAL DA (or MDA) means that there is a CONDITION associated with using the Conditional Minimum. You HAVE TO then hunt for the condition, printed usually somewhere on the chart itself. I don't have the Launy Charts on hand (so you obviously have to verify this), but from memory it is associated with a higher minima in the absence of an ACTUAL QNH, such as when the tower man is home sleeping. Good luck
on your exam.