The blood pressure values of four persons are given below
(i) Mr. A 120/80 mm Hg
(ii)Mr. B 80/120 mm Hg
(iii) Mrs A 90/80 mm Hg
(iv) Mrs. B 150/80 mm Hg
Who among the following has normal blood pressure ?

Options

A. Mr. A
B. Mr. B
C. Mrs. A
D. Mrs. B

Answer

To determine who among the four persons has normal blood pressure, we need to analyze the given blood pressure readings based on the standard values for normal blood pressure.

### Step-by-Step Solution:

1. **Understand Blood Pressure Readings**: Blood pressure is measured in millimeters of mercury (mm Hg) and is represented as two numbers: systolic pressure (the first number) and diastolic pressure (the second number). The normal range for blood pressure is typically around 120/80 mm Hg.

2. **Evaluate Each Person's Blood Pressure**:
- **Mr. A**: 120/80 mm Hg
- This reading is within the normal range.
- **Mr. B**: 80/120 mm Hg
- This reading is abnormal as the systolic pressure (80) is lower than the diastolic pressure (120).
- **Mrs. A**: 90/80 mm Hg
- This reading is also abnormal since the systolic pressure (90) is lower than the diastolic pressure (80).
- **Mrs. B**: 150/80 mm Hg
- This reading indicates high systolic pressure (150), which is considered hypertension.

3. **Identify the Normal Blood Pressure**:
- Among the four individuals, only Mr. A has a blood pressure reading of 120/80 mm Hg, which is classified as normal.

4. **Conclusion**:
- Therefore, the person with normal blood pressure is **Mr. A**.

### Final Answer:
Mr. A has normal blood pressure.

---