MRSA has emerged as a serious infectious disease, with the first case of methicillin-resistant S. aureus being detected in 1961. Why are medical professionals so concerned when antibiotics exist that can kill MRSA? a. MRSA can transfer methicillin-resistance to other bacteria. b. Patients are not treated with correct antibiotics rapidly enough to prevent serious illness. c. MRSA could acquire additional antibiotic resistance genes from other bacteria to become a “super bug.” d. All of the above