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: Social & Preventive Medicine
What is the content of ethinyl estradiol in very low 
Select and explain. 
A. 30µg, B. 25µg, C. 20µg, D. 15µg
C: 20µg
Answer: C: 20µg 
Explanation: None