<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 57-year-old man presents to the clinic for a chronic cough over the past 4 months. The patient reports a productive yellowgreen cough that is worse at night. He denies any significant precipitating event prior to his symptoms. He denies fever, chest pain, palpitations, weight changes, or abdominal pain, but endorses some difficulty breathing that waxes and wanes. He denies alcohol usage but endorses a 35 pack-year smoking history. A physical examination demonstrates mild wheezes, bibasilar crackles, and mild clubbing of his fingertips. A pulmonary function test is subsequently ordered, and partial results are shown below:Tidal volume: 500 mLResidual volume: 1700 mLExpiratory reserve volume: 1500 mLInspiratory reserve volume: 3000 mLWhat is the functional residual capacity of this patient?? A: 2000 mL, B: 2200 mL, C: 3200 mL, D: 3500 mL, E: 4500 mL,  <response>: This is a pulmonary function test question involving calculating the functional residual capacity FRC based on provided lung volume values. FRC is the volume of air present in the lungs at the end of passive expiration. It can be calculated by adding the expiratory reserve volume ERV and residual volume RV. Here, ERV is 1500 mL and RV is 1700 mL, so FRC ERV RV 1500 mL 1700 mL 3200 mL.C: 3200 mL 