The larvae that exhibit extraintestinal migration and nocturnal periodicity respectively

Options

A. Larva of Wuchereria and larva of Taenia
B. Larva of Taenia and larva of Ascaris
C. Larva of Ascrais and larva of Wuchereria
D. Both are exhibited by microfilaria of Wuchereria

Answer

To solve the question about the larvae that exhibit extraintestinal migration and nocturnal periodicity, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Extraintestinal Migration**:
- Extraintestinal migration refers to the movement of larvae from the intestines to other parts of the body.
- The organism known for this type of migration is **Ascaris lumbricoides**. The larvae of Ascaris emerge from eggs ingested by humans, migrate through the intestinal walls, enter the bloodstream, travel to the lungs, and eventually return to the intestines.

2. **Understand Nocturnal Periodicity**:
- Nocturnal periodicity refers to the phenomenon where certain larvae are present in the bloodstream primarily at night.
- This characteristic is exhibited by **microfilariae**, which are the larvae of filarial worms. These larvae circulate in the blood during the night, typically peaking in density between midnight and 2 AM.

3. **Identify the Correct Pair**:
- Based on the definitions:
- **Ascaris lumbricoides** larvae exhibit extraintestinal migration.
- **Microfilariae** exhibit nocturnal periodicity.
- Therefore, the correct pairing for the question is Ascaris lumbricoides for extraintestinal migration and microfilariae for nocturnal periodicity.

4. **Select the Correct Answer**:
- From the options given in the question, the correct answer is the one that states:
- **Larva of Ascaris (extraintestinal migration) and larva of Wuchereria (nocturnal periodicity)**.

### Final Answer:
The larvae that exhibit extraintestinal migration and nocturnal periodicity respectively are the larvae of **Ascaris lumbricoides** and **microfilariae** (from Wuchereria).