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: Physiology
A newly posted junior doctor had difficulty in finding out base deficit/excess for blood in a given patient. An experienced senior resident advised a quick method to determine acid base composition of blood based on PCO2. Which of the following is the likely method he suggested to predict acid base composition of blood? 
Select and explain. 
A. Red ford normogram, B. DuBio's normogram, C. Goldman constant field equation, D. Siggard-Andersen normogram
D: Siggard-Andersen normogram
Answer: D: Siggard-Andersen normogram 
Explanation: D i.e. Siggard - Anderson normogram