Antibacterial spectrum of clindamycin includes many gram-positive organisms like __________, and some gram-negative organisms & anaerobes, unlike ___________.

A) Staphylococcus aureus; aminoglycosides
B) Streptococcus pneumoniae; macrolides
C) Escherichia coli; penicillins
D) Clostridium perfringens; aminoglycosides