Apronoun which points out a particular person, place, or thing is a:
interrogative pronoun
demonstrative pronoun

hello which   of the following there is nothing!

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.