Ronia is prescribed penicillin to treat an infection. She last took penicillin two years earlier for the first time and suffered no allergic reaction. However, with this round of penicillin treatment, she is experiencing hives, rash and wheezing. What happened?
A. An initial "sensitizing dose" of penicillin lead to the production of IgM antibodies; causing future allergic reactions.
B. An initial "predisposing dose" of penicillin lead to the production of IgM antibodies; causing future allergic reactions.
C. An initial "sensitizing dose" of penicillin lead to the production of IgE antibodies; causing future allergic reactions.
D. An initial "predisposing dose" of penicillin lead to the production of IgE antibodies; causing future allergic reactions.
Answer: C
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