Topic: Group verb,

Best Answer Explained in Below-:

The phrase "Take this medicine and you will soon come round" refers to the process of recovering from an illness or feeling better after a period of being unwell. The expression "come round" specifically implies regaining consciousness, health, or a stable state after being ill. This colloquial usage is common in British English.

The other options, while they may seem plausible, do not fit contextually or idiomatically in the same way.

- **A) over**: "Come over" typically refers to moving from one place to another, which doesn't convey the idea of recovery.
- **C) about**: "Come about" usually means to occur or happen, and again, lacks the recovery connotation.
- **D) down**: "Come down" can indicate a decline or acquiring a sense of sadness or illness, not necessarily recovery.

Thus, “come round” is the perfect choice in this sentence as it directly relates to the process of healing and revitalization after taking medicine, which is the intended implication of the statement.