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
[{'content': '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 \nSelect and explain. \nA. ab, B. ac, C. ad, D. bd', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]