This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
A new method of measuring Haemoglobin levels has been developed. Ten successive readings of a single sample are as follows: 9.4, 10.4, 9.6, 9.1, 10.8, 12.1, 10.1, 9.8, 9.2, 9.5. But the Haemoglobin measured by standard calorimetry was 10.2. Therefore the given method has 
Select and explain. 
A. Low validity, low reliability, B. High validity, low reliability, C. High validity, high reliability, D. Low validity, high reliability
B: High validity, low reliability
Answer: B: High validity, low reliability 
Explanation: Reliability is precision (repeatability) and Validity is accuracy (close to true/actual value)

In the given question, 10 successive readings are all different and they have a mean value of 9.4+10.4+9.6+9.1+10.8+12.1+10.1+9.8+9.2+9.5/10 = 10.0
Thus it has low reliability (non-consistent) and high validity (close to true/actual value of 10.2)