Size of Graafian follicle?
**Core Concept**
The **Graafian follicle** is a mature **ovarian follicle** that is ready to release an **ovum** during **ovulation**. It is the final stage of follicular development in the **ovary**. The size of the Graafian follicle is a critical indicator of its maturity.
**Why the Correct Answer is Right**
The correct answer is related to the size of the Graafian follicle, which is approximately 18-24 mm in diameter. This size indicates that the follicle has reached its maximum growth and is ready to release an ovum. The **luteinizing hormone (LH) surge** plays a crucial role in the final maturation and ovulation of the Graafian follicle.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it represents a smaller follicle size, which is not indicative of a mature Graafian follicle.
**Option B:** This option is also incorrect as it is smaller than the expected size of a mature Graafian follicle.
**Option D:** This option is incorrect because it represents a larger size than expected for a Graafian follicle.
**Clinical Pearl / High-Yield Fact**
The size of the Graafian follicle is crucial in **assisted reproductive technologies (ART)**, such as **in vitro fertilization (IVF)**, where follicular size and maturity are closely monitored to determine the optimal time for **ovulation induction**.
**Correct Answer:** Correct Answer: C. 18-24 mm