Question: How do I keep track of my menstruation?

  Options: 
 A. Keep a small spoon and a red pen in your nightstand, when your period starts, mark the spoon with a red x on the days you menstruate, that way you can tell how long it is from one period to another.
 B. Keep a small calendar and a red pen in your nightstand, when your period starts, mark the calendar with a red x on the days you menstruate, that way you can tell how long it is from one period to another.
Answer: B