Medicine for respiratory problems is got from
(a) Calotropis
(b) Eucalyptus
(c) Ephedra
(d) Cannabis

Options

A. Calotropis
B. Eucalyptus
C. Ephedra
D. Cannabis.

Answer

To solve the question "Medicine for respiratory problems is got from," we need to analyze the options provided and identify which plant is known for its medicinal properties related to respiratory issues.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which plant is used to derive medicine for respiratory problems. We need to evaluate each option to find the correct answer.

2. **Analyzing Option (a) Calotropis**:
- Calotropis is known for its various medicinal uses, but it is not specifically recognized for treating respiratory problems. Therefore, this option is unlikely to be correct.

3. **Analyzing Option (b) Eucalyptus**:
- Eucalyptus is known for its medicinal properties, particularly for its use in treating colds and respiratory issues due to its essential oils. However, it is not the primary source of a specific medicine for respiratory problems.

4. **Analyzing Option (c) Ephedra**:
- Ephedra is known to contain ephedrine, a drug that is specifically used to treat respiratory problems. Ephedrine acts as a stimulant, helps increase vital signs, and dilates bronchioles, making it effective for respiratory issues. This option is likely to be correct.

5. **Analyzing Option (d) Cannabis**:
- Cannabis is primarily known for its psychoactive properties and is not used to derive medicines for respiratory problems. It is more associated with compounds that act as hallucinogens.

6. **Conclusion**: After analyzing all the options, the correct answer is (c) Ephedra, as it is the plant from which the medicine for respiratory problems, specifically ephedrine, is derived.

### Final Answer:
(c) Ephedra