Read the following article and answer the question by choosing from the options.

Thanks . But yeah , lung x - rays were good but there was still the sound of " rice crispies " ( as my doctor put it ) in my left lung so I was given a nebulizer treatment . It ... uh ... helped . I 'll leave it at that .

What may be the reason why they needed lung xrays ?
Options: - They were going to be having surgery .. - They had an infection .. - None of the above choices .. - They needed one for insurance purposes .....A:
They had an infection .