Answer: B
T36.0X1 is appropriate here because it is used to specify poisoning by penicillins accidentally or unintentionally.
Option A is not correct because T36.0X2 is used to specify intentional poisoning by penicillin. Here, poisoning is accidental.
Option C is not correct because T36.0X3 specifies poisoning by penicillin for assault. Here, no details of an assault are mentioned.
Option D is not correct because T36.0X6 specifies the underdosing of penicillin. Here, overdosing is seen.