Book excerpt: Single best answer (SBA) questions have been introduced into the FRCR Part 2A examination of the Royal College of Radiologists in the UK for the first time. This book of 600 SBA questions and explanatory answers has been written to aid students preparing for the exam by current trainees in clinical radiology, coordinated through The Society of Radiologists in Training (SRT). Questions are grouped by topic and each topic is split into three papers of 70 questions, with explanations separated into chapters to enable readers to either attempt a whole mock exam paper or to browse question by question. The book is a bridge between a pure revision aid and a reference text, including a bibliography of useful references for further information. Candidates for other professional exams in Radiology will find the text useful, as will and those from other specialties wishing to explore the radiological aspects of their syllabus in greater depth. This is a companion volume to Final FRCR Part A Modules 4-6 Single Best Answer MCQs by the same team.