Clindamycin
Clindamycin is an antibiotic used for the treatment of a number of bacterial infections , including bone or joint infections , pelvic inflammatory disease , strep throat , pneumonia , middle ear infections , and endocarditis . 
<triplet> Clindamycin <subj> antibiotic <obj> subject has role <triplet> pneumonia <subj> antibiotic <obj> drug used for treatment