This is an interesting question!!!.
River name flower name heroin name and a movie name are same. For four question we will have same answer.
So, the answer for this question is :
1.River Name----- Mandakini is the river in originates near kedarnath in uttarakandh.
2.Flower Name ----Mandakini is the name of the flower.
3.Heroine Name---- Mandakini is the name of the heroine.
4.Movie name: Madakini is the name of movie.
SO, CORRECT ANSWER IS Mandakini