The correct option is
B Follicle
Calotropis represents a fruit in which two follicle type of simple, dry and dehiscent fruitlets develop from a single flower. A follicle is a fruit which dehisces from one suture.Nut is an indehiscent fruit.
Berry is a succulent fruit.
Siliqua is a dehiscent fruit in which a false septum called replum which is absent in calotropis. So, the correct answer is 'Follicle'.