<prompt> A 60 year old woman was bedridden for 2 months complains of breathlessness chest pain, chest X-ray is normal.Next step isVQ scanEchocardiographyPulmonary wedge angiographyPulmonary arteriography.  <response>: Clinical picture so P.embolism Next step should be CT Pulmo angiography - not there in option thus VQ scan next best. 