This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: International health agencies, Subject name: Social & Preventive Medicine
Air travel in Pregnancy is permitted up to ________ weeks period of gestation:- 
Select and explain. 
A. 28, B. 32, C. 36, D. 40
C: 36
Answer: C: 36 
Explanation: WHO IHR's guidelines for air travel in pregnancy upto 36 weeks of period of gestation with single baby.(If twins upto 32 weeks POG) After 28 weeks, mother should carry EDD ceificate.