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
Meningococcal vaccine - 
Select and explain. 
A. ACW135Y, B. ABCW135, C. CYW135 B, D. ABCY
A: ACW135Y
Answer: A: ACW135Y 
Explanation: None