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
Best preventive measure against tetanus neonatorum - 
Select and explain. 
A. Active immunization of mother, B. Passive immunization of child, C. Active immunization of child, D. Passive immunization of mother
A: Active immunization of mother
Answer: A: Active immunization of mother 
Explanation: None