This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Physiology
Weight of 1 cc of air at normal pressure and temperature 
Select and explain. 
A. 0.001297g, B. 0.002345g, C. 0.004g, D. 1.OOOg
A: 0.001297g
Answer: A: 0.001297g 
Explanation: Ans: a (0.001297g)Weight of 1 cc of air at normal temperature and pressure is 0.001297g