This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Renal physiology, Subject name: Physiology
PCT secretes 
Select and explain. 
A. Sodium, B. Glucose, C. Hydrogen ions, D. Amino acids
C: Hydrogen ions
Answer: C: Hydrogen ions 
Explanation: PCT secretes H+ into tubule thus helping in excretion . Ref: Ganong's review of medical physiology; 24th edition; page no: 685