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 ?
Available options: a). They were going to be having surgery . b). They had an infection . c). None of the above choices . d). They needed one for insurance purposes ....A:
b).