This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdominal Radiography, Subject name: Radiology
[{'content': 'Most useful investigation of choice for liver abscess is \nSelect and explain. \nA. Exploratory laparotomy, B. Ultrasound, C. Liver enzymes, D. Parasite in the stool', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) UltrasoundRef: Bailey & Love 25th 169* On ultrasound, an abscess cavity in the liver is seen as a hypoechoic or anechoic lesion with ill-defined borders; internal echoes suggest necrotic material or debris. The investigation is very accurate and is used for aspiration, both diagnostic and therapeutic.* Where there is doubt about the diagnosis, a computerized tomography (CT) scan may be helpful.Also KnowDiagnostic pointers for infection with Entamoeba histolytica* Bloody mucoid diarrhoea in a patient from an endemic area or following a recent visit to such a place* Upper abdominal pain, fever, cough, malaise* In chronic cases, a mass in the right iliac fossa = amoeboma* Sigmoidoscopy shows typical ulcers--biopsy and scrapings may be diagnostic* Serological tests are highly sensitive and specific outside endemic areas* Ultrasound and CT scans are the imaging methods of choice.', 'role': 'assistant'}]