Text format (blank line between questions):

What is 2 + 2?
A) 3
B) 4 *
C) 5
D) 6
Explanation: 2 + 2 equals 4.

Marking the correct answer:
  - Put * after the option:  B) Paris *
  - Write (correct):  B) Paris (correct)
  - Add an Answer line:  Answer: B

Option formats supported:
  A) ...   a) ...   A. ...   (A) ...

CSV format (with header row):
question,optionA,optionB,optionC,optionD,answer,explanation
"What is 2+2?","3","4","5","6","B","Basic addition"