This solution is wrong... It ideally should have been "disambar KA mahina".... Or else at least "disambar mahina"... But clearly this answer "mahina disambar" is outrightly wrong!!
If the question was 'This is December month', the answer could have been 'Yah December kaa mahinaa hai'. For the given question, the answer is right.
What is the difference between Mahina December and December Mahina?