Read the following context and answer the question.
Context: My sister was inbetween health insurances in her job , and of course , needed emergency gall bladder surgery . The surgeon wanted $ 4000 , they agreed on $ 2000 . She had the surgery , and when she told me the cost , as a Medical Biller I advised her that ins co have fee schedules and would pay between $ 500 and $ 900 depending on the co.
Question: Why is it necessary to say " of course " my sister needed surgery ?
Answer:


Because it is an ironic thing .. that yes , now that she needed it , she did n't have it .