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: Medicine
A 50 years old male patient with weight 65 kg, pH 7.05, PCO, 15 mmHg, HCO3 5 mEq/L and base excess/ deficit -40 mEq/L. How much sodium bicarbonate has to be given in first 4 hour 
Select and explain. 
A. 150 mEq, B. 300 mEq, C. 450 mEq, D. 600 mEq
A: 150 mEq
Answer: A: 150 mEq 
Explanation: Answer- A. 150 mEq