Given a passage, construct a question on the basis of the information present in the passage. Construct the question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) it answer uses text phrases from the passage. Avoid creating questions that (i) can't be answered correctly without actually understanding the passage and (ii) uses the same words or phrases given in the passage.
Q: The need for liver biopsy is increasing with the increasing availability of treatments for liver disease, in particular interferon. For this reason the procedure must be efficient and economical, as well as safe.', "Firstly to assess the safety of outpatient liver biopsy when performed with ultrasound guidance and the 'Biopty' gun. Secondly, to compare the cost of an outpatient and inpatient procedure.", "Two hundred and fifty consecutive liver biopsies performed over a two year period at St Vincent's Hospital, Melbourne were reviewed retrospectively. Indications, histological findings and complications were recorded.", 'Seventy per cent of the biopsies were performed as an outpatient procedure. There were no major complications. Four patients experienced prolonged pain post biopsy. The average cost for an outpatient biopsy was $351, the cost of an inpatient (overnight stay) was $690.
A:
Is outpatient liver biopsy using ultrasound guidance and the Biopty gun safe and cost effective?