A patient has developed a clot in his heart. Which of these enzymes can be used to bust this clot ?

Options

A. Amylase
B. Streptokinase
C. Pectinase
D. Protease

Answer

To solve the question regarding which enzyme can be used to bust a clot in the heart, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Problem**: The question states that a patient has developed a clot in the heart. We need to identify which enzyme from the given options can effectively dissolve or bust this clot.

2. **Analyzing the Options**:
- **A. Amylase**: This enzyme is primarily involved in the digestion of carbohydrates. It does not play a role in dissolving blood clots.
- **B. Streptokinase**: This enzyme is known for its ability to dissolve blood clots. It is produced by the bacterium Streptococcus and is commonly used in medical treatments for clot removal.
- **C. Pactinase**: This enzyme is not widely recognized in the context of clot dissolution and does not have a known role in this process.
- **D. Protease**: While proteases break down proteins, they are not specifically used for dissolving blood clots.

3. **Identifying the Correct Answer**: Based on the analysis, the only enzyme among the options that is specifically used to bust blood clots is **Streptokinase**.

4. **Conclusion**: Therefore, the correct answer to the question is **B. Streptokinase**.

### Final Answer:
**B. Streptokinase**