15683
Serum samples were used from a recently performed clinical trial in patients with antibody deficiency or increased susceptibility to respiratory tract infections that were randomized to either placebo or high - dose ( 4000 IU / day ) vitamin D for 12 months .
 Chemical: vitamin D
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: vitamin D 
Answer:
 Chemical: vitamin D