This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
Which of the following is not a component of APACHE score ? 
Select and explain. 
A. Serum Potassium, B. Serum Sodium, C. Serum Calcium, D. Creatinine
C: Serum Calcium
Answer: C: Serum Calcium 
Explanation: .APACHE II (Acute Physiology and Chronic Health Evaluation II) point score is calculated from a patient&;s age and 12 routine physiological measurements: PaO2 Temperature Mean aerial pressure pH aerial Hea rate Respiratory rate Serum Sodium Serum Potassium Creatinine Hematocrit White blood cell count Glasgow Coma Scale S.Ca is pa of Ransons criteria