A concerned parent has her 3-month-old at the office of the NP. The baby has a bluish cast to the skin and is listless. The parent says she felt the baby's "mouth was sore" so she treated it with Baby Orajel (Benzocaine). The NP knows that the infant has:
Group of answer choices
D. Cyanosis
C. Early heart failure
A. Methemoglobinemia
B. Tetralogy of Fallot