This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
Kussumauls breathing 
Select and explain. 
A. Metabolic alkalosis, B. Respiratory alkalosis, C. Respiratory acidosis, D. Metabolic acidosis
D: Metabolic acidosis
Answer: D: Metabolic acidosis 
Explanation: Rapid,deep(Kussmaul) breathing usually implies metabolic acidosis but may also occur with pontomesencephalic lesions. Ref:Harrison's medicine -18th edition,page no:2251.