Answer to Q3: c

Cardiac cath is not indicated in a patient with no reversible defect.

Echo is not going to add anything to solve the patient's chief complaint.

Methacholine challenge is a screening tool in the evaluation of cough of unknown origin, not for chest discomfort.

EGD (esophago-gastro-duodenoscopy) will not elicit the temporal correlation of reflux with the symptoms therefore pH monitoring will be the test of choice as it will elicit reflux over time and the patient will record his symptoms. These will be correlated on analysis of the recordings.