The correct answer is Graafian follicle.
Graafian follicle or tertiary vesicular follicles is the follicular stage before ovulation. It, therefore, contains a 2N haploid secondary oocyte that has undergone the first meiotic division. This follicle is characterized by a large follicular antrum with eccentrically located oocyte surrounded by the zona pellucida and a layer of several cells known as the corona radiata.