Largest frog is

Options

A. Rana goliath
B. Rhinodon typus
C. hyla arborea
D. Alytes obstetricans

Answer

To determine the largest frog, we need to analyze the options provided and identify which one is recognized as the largest species.

### Step-by-Step Solution:

1. **Identify the Options**: The question provides four options for the largest frog:
- A) Rhino Goliath (Goliath Frog)
- B) Rhinodon typus
- C) Hyla arborea
- D) Aletus or optic trichens

2. **Analyze Each Option**:
- **Option A: Rhino Goliath (Goliath Frog)**: This frog is commonly known as the Goliath Bullfrog. It is recognized as the largest living frog species, with specimens growing up to 32 centimeters in length from snout to vent.
- **Option B: Rhinodon typus**: The maximum length for this type of frog is uncertain, but it is noted to be around 18.3 centimeters. This does not make it the largest.
- **Option C: Hyla arborea**: This is a small European tree frog, which is also not large in size.
- **Option D: Aletus or optic trichens**: This species is known as the common midwife toad and is not the largest frog.

3. **Conclusion**: Based on the analysis, the Goliath Frog (Rhino Goliath) is confirmed to be the largest frog, as it can grow up to 32 centimeters in length, which is significantly larger than the other options.

4. **Final Answer**: The largest frog is **A) Rhino Goliath (Goliath Frog)**.