This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
The Hb level in healthy women has to mean 13.5 g/dl and standard detion 1.5 g/dl, what is the Z score for a woman with Hb level 16.5 g/dl 
Select and explain. 
A. 9, B. 10, C. 2, D. 1
C: 2
Answer: C: 2 
Explanation: Z = Individual value - mean SD 16.5 - 13.5 = 2 1.5