Read the following statements and choose the correct option .
The pills mostly used for birth control contains
I. oestrogen
II. progesterone
III. prolactin
IV. cholecystokinin
Codes

Options

A. I, II and III
B. I and II
C. II and IV
D. I and III

Answer

To solve the question regarding the components of birth control pills, let's break it down step by step:

### Step 1: Identify the hormones mentioned in the question
The question lists four hormones:
1. Oestrogen
2. Progesterone
3. Prolactin
4. Cholecystokinin

### Step 2: Understand the role of each hormone
- **Oestrogen**: This is a key female sex hormone that plays a crucial role in the menstrual cycle and is often included in birth control pills.
- **Progesterone**: Another essential female hormone that helps regulate the menstrual cycle and is also commonly found in birth control pills.
- **Prolactin**: This hormone is primarily involved in milk production and does not play a role in birth control.
- **Cholecystokinin**: This hormone is involved in digestion and does not have a role in birth control.

### Step 3: Determine which hormones are used in birth control pills
Birth control pills primarily contain:
- **Oestrogen**
- **Progesterone**

These two hormones work together to prevent ovulation, thereby preventing pregnancy.

### Step 4: Eliminate the incorrect options
From the analysis:
- Prolactin and Cholecystokinin are not used in birth control pills.
- Therefore, the correct components of birth control pills are Oestrogen (I) and Progesterone (II).

### Step 5: Choose the correct option
The correct answer is:
**I. Oestrogen and II. Progesterone** (Option B).