This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunization, Subject name: Pediatrics
[{'content': 'Which of the following is a live attenuated bacterial vaccine? \nSelect and explain. \nA. Tetanus, B. Hepatitis B vaccine, C. Injectable polio vaccine, D. BCG', 'role': 'user'}, {'content': 'Answer: D \nExplanation: ANSWER: (D) BCGREF: APPENDIX-46 below for "TYPES OF VACCINE"Live vaccines can me memorized as "BOMBEY-VT"; BCG, OPV (sabin), MMR (mumps, measles & rubella), Bubonic plague, epidemic typhus, yellow fever (17D), vaccinia, Oral Typhoid vaccine (Ty21a) APPENDIX - 46Types of VaccineTypeContentExamplesKilled vaccineskilled, but previously virulent, microorganisms that have been destroyed with chemicals or heat.Avian Flu vaccine; developed by Reverse Genetics techniques. Reverse genetics\' is an approach to discovering the function of a gene by analyzing the phenotypic effects of specific gene sequences obtained by DNA sequencing. This investigative process proceeds in the opposite direction of so- called forward genetic screens of classical genetics. Simply put, while forward genetics seeks to find the genetic basis of a phenotype or trait, reverse genetics seeks to find what phenotypes arise as a result of particular genes.', 'role': 'assistant'}]