Although the abscess was incised and drained in the emergency room and cultures were obtained, which grew coag-positive staphylococcus.

which of the below holds good for the above sentence.

1.This is a run-on that needs a semicolon after time.

2. This is a run-on that needs to be split into two separate sentences.

3.This is a fragment that can be fixed by adding a comma after incised.

4.This is a fragment that can be fixed by removing the word although.
The sentence is fine as it is.

See my previous answer for this question.

I would go with 4. Removing "Although" makes it an acceptable but rather confusing sentence. The word "which" apparently applies to the cultures (NOT the emergency room and cultures). I am not sure if the comma in front of "which" is necessary or correct. The comma should be placed after "emergency room".

It would be better as two sentences.

It looks as if Jennifer/Martha/Troy/Deeksha/mike/melody/kristin/nicole can't figure out who he/she really is. That's probably why he/she didn't read Ms. Sue's previous answer.

The hospitalization was prolonged because of the absence of any good choices for oral medications to treat his UTI.

The correct option in this case would be:

2. This is a run-on that needs to be split into two separate sentences.

Explanation:
A run-on sentence occurs when two or more independent clauses are combined without proper punctuation or conjunctions. In the given sentence, we have two independent clauses:
1. "Although the abscess was incised and drained in the emergency room and cultures were obtained."
2. "which grew coag-positive staphylococcus."

These two clauses are joined together without any punctuation or conjunction, making it a run-on sentence. To correct this, we could split it into two separate sentences:

"Although the abscess was incised and drained in the emergency room and cultures were obtained. The cultures grew coag-positive staphylococcus."