Smallest Dinosaur was

Options

A. Tyrannosaurus
B. Compsognathus
C. Pterosaur
D. Pilosaur.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the smallest dinosaur among the given options.

2. **Analyzing the Options**: The options provided are:
- Tyrannosaurus
- Comsognathus
- Pterosaur
- Pilosaur

3. **Identifying Characteristics of Each Option**:
- **Tyrannosaurus**: Known as one of the largest carnivorous dinosaurs, it is not the smallest.
- **Comsognathus**: This dinosaur is recognized as one of the smallest dinosaurs discovered, making it a strong candidate for the answer.
- **Pterosaur**: Not a dinosaur, but a flying reptile, so it cannot be considered in this context.
- **Pilosaur**: Also not a dinosaur; it is a marine reptile and thus irrelevant to the question.

4. **Conclusion**: Based on the analysis, the smallest dinosaur among the options is **Comsognathus**.

5. **Final Answer**: The correct answer is **Comsognathus**.

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