The emergence of a mature Graafian follicle is evident around:
a) 18th day of menstrual cycle
b) 18 - 23rd day of menstrual cycle
c) 11 - 17th day of menstrual cycle
d) 20th day of menstrual cycle

Options

A. 18th day of menstrual cycle
B. 18 - 23rd day of menstrual cycle
C. 11 - 17th day of menstrual cycle
D. 20th day of menstrual cycle

Explanation

To solve the question regarding the emergence of a mature Graafian follicle during the menstrual cycle, we can follow these steps:

### Step 1: Understand the Menstrual Cycle Phases
The menstrual cycle is divided into several phases: the follicular phase, ovulation, and the luteal phase. The follicular phase is where the follicles develop, and the Graafian follicle matures.

### Step 2: Identify the Timing of Follicle Development
The development of the Graafian follicle occurs during the follicular phase. This phase typically starts around the 1st day of menstruation and lasts until ovulation, which usually occurs around the 14th day of a typical 28-day cycle.

### Step 3: Determine the Days of Follicle Maturation
The maturation of the Graafian follicle is evident approximately 11 to 15 days before ovulation. Since ovulation generally occurs around the 14th day, the emergence of a mature Graafian follicle would be expected to occur between the 11th and 15th days of the menstrual cycle.

### Step 4: Analyze the Options
Now, let's analyze the options provided:
- a) 18th day of menstrual cycle - This is after ovulation.
- b) 18 - 23rd day of menstrual cycle - This is also after ovulation.
- c) 11 - 17th day of menstrual cycle - This range includes the days leading up to ovulation.
- d) 20th day of menstrual cycle - This is also after ovulation.

### Step 5: Select the Correct Answer
From the analysis, the correct answer is **c) 11 - 17th day of menstrual cycle**, as this range includes the days when the Graafian follicle matures before ovulation.