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
Surfactant production in lungs stas at : 
Select and explain. 
A. 28 weeks, B. 32 weeks, C. 34 wks, D. 36 wks
A: 28 weeks
Answer: A: 28 weeks 
Explanation: A i.e. 28 Weeks