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: Medicine
True about pneumococcal vaccine is  a) Not given if age is less than 2 years  b) Not given in splenectomy patients  c) Polyvalent  d) Derived from capsular protein 
Select and explain. 
A. ab, B. ac, C. ad, D. bd
B: ac
Answer: B: ac 
Explanation: None