Question

Fill in the blank in the extra intestinal migration of Rhabditiform larva.

\[ \text{Liver} \rightarrow \underline{\hspace{2cm}} \rightarrow \text{Heart} \rightarrow \text{Lungs} \rightarrow \text{Pharynx} \rightarrow \text{Intestine} \]

• A. Hepatic portal vein
• B. Post caval vein
• C. Bile duct
• D. Pulmonary vein

Hint:

Migration pathway of Ascaris larva: \[ \boxed{ \text{Intestine} \rightarrow \text{Liver} \rightarrow \text{Post caval vein} \rightarrow \text{Heart} \rightarrow \text{Lungs} \rightarrow \text{Pharynx} \rightarrow \text{Intestine} } \]

Answer 1

The Correct Option is B

Step 1: Recall the migration pathway of Ascaris larva. The extra-intestinal migration follows the sequence \[ \boxed{ \text{Intestine} \rightarrow \text{Liver} \rightarrow \text{Post caval vein} \rightarrow \text{Heart} \rightarrow \text{Lungs} \rightarrow \text{Pharynx} \rightarrow \text{Intestine} } \]

Step 2: Identify the missing structure. Between the liver and the heart, the larva passes through the \[ \boxed{\text{Post caval vein}.} \]

Step 3: Choose the correct option. Therefore, \[ \boxed{(B)} \] is the correct answer.