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
Daily requirement of zinc in humans is? 
Select and explain. 
A. 8 mg/day, B. 9.4 mg/day, C. 11mg/day, D. 15mg/day
B: 9.4 mg/day
Answer: B: 9.4 mg/day 
Explanation: 9.4 mg/day REF: Ganong's 22nd ed p. 314 Male Female Daily requirement 9.4 mg/d 6.8 mg/d RDA llmg/d 8mg/d