study the given statement and answer the question.
"During 'P' phase of the mentrual cycle, if pregnancy doesn't happen, the 'Q' withers and dies usually around day 22 in a 28-day cycle . The drop in 'R' levels cause the lining of the utrerus to fall away. This is know as 's'. Identify P, Q, R and S.

Options

A. (1) P `to` Menstrual, Q `to` Graafian follicle, R `to` Estrogen, S `to` Menarche
B. (2) P `to` luteal, Q `to` Corpus lutenm, R `to` Progesterone , S `to` menstruation
C. (3) P `to` Ovulatory, Q `to` Endometrium, R `to` Follicle stimulating hormone, S `to` Menopause
D. (4) P `to` Follicular, Q `to` secondary oocyte, R `to` Luteinizing hormone, S `to` Menstruation

Answer

To solve the question, we need to identify the terms P, Q, R, and S based on the provided statement about the menstrual cycle. Let's break it down step by step:

### Step 1: Identify P
- The statement mentions a phase of the menstrual cycle where if pregnancy does not occur, something withers and dies. This phase is known as the **luteal phase**.
- **P = Luteal Phase**

### Step 2: Identify Q
- The statement indicates that during the luteal phase, if pregnancy does not happen, a structure withers and dies around day 22. This structure is the **corpus luteum**, which forms from the Graafian follicle after ovulation.
- **Q = Corpus Luteum**

### Step 3: Identify R
- The next part of the statement refers to a drop in hormone levels that causes the lining of the uterus to fall away. The hormone primarily responsible for maintaining the uterine lining during the luteal phase is **progesterone**. When the corpus luteum dies, progesterone levels drop.
- **R = Progesterone**

### Step 4: Identify S
- Finally, the process that occurs when the uterine lining falls away due to the drop in progesterone levels is known as **menstruation**. This is the shedding of the endometrial lining.
- **S = Menstruation**

### Final Answer:
- P = Luteal Phase
- Q = Corpus Luteum
- R = Progesterone
- S = Menstruation

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