Second stage larva of liver fluke goes on three week typical wandering tour. The course of travel is as follows,

Options

A. Small intestine,liver, heart, lung
B. small intestine, lung, liver
C. small intestine, liver, lung, heart
D. liver, heart, lung, small intestine

Answer

To solve the question about the wandering tour of the second stage larva of the liver fluke, we need to follow the path that this larva takes through the host's body. Here’s the step-by-step breakdown:

### Step 1: Identify the Starting Point
The second stage larva of the liver fluke begins its journey in the **small intestine** of the host (usually a human).

**Hint:** Remember that the small intestine is where the larva enters after being ingested.

### Step 2: First Destination
From the small intestine, the larva travels to the **liver**. This is a crucial step as the liver is where the liver fluke establishes itself and matures.

**Hint:** Consider the organs that are directly connected to the small intestine and are involved in digestion and metabolism.

### Step 3: Second Destination
After the liver, the larva moves into the **heart**. This movement occurs via the circulatory system, as the liver is connected to the heart through blood vessels.

**Hint:** Think about how blood circulates through the body and how the liver is part of this system.

### Step 4: Final Destination
The larva then travels from the heart to the **lungs**. Here, it reaches the alveoli, where it undergoes molting to become the third stage larva.

**Hint:** Recall the respiratory system and how blood from the heart is pumped to the lungs for oxygenation.

### Conclusion
Putting it all together, the correct sequence of the wandering tour of the second stage larva of the liver fluke is:
1. Small intestine
2. Liver
3. Heart
4. Lung

Thus, the correct answer is the first option: **small intestine, liver, heart, lung**.

### Summary of Steps:
1. Start at the small intestine.
2. Move to the liver.
3. Travel to the heart.
4. End at the lungs.