This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
Which of the following is the investigation of choice in assessing hearing loss in neonates? 
Select and explain. 
A. Impedance audiometry, B. BAER, C. Free field audiometry, D. Behavioral audiometry
B: BAER
Answer: B: BAER 
Explanation: * The Brainstem auditory evoked response (BAER) test measures responses in brain waves that are stimulated by a clicking sound to check the central auditory (Hearing) pathways of the brainstem. The test can be done for all ages. * Infant test or (Bih to 1 year) * Toddler test or (1 to 3 years) * Preschooler Test or (3 to 6 years) * School age test or (6- 12 years) * Adolescent test (12 to 18 years) ' * The test is performed to help diagnose nervous system abnormalities, hearing losses (especially in low-bih weight newborns), and to assess neurologic functions. * The auditory brain stem values are in a normal range. * This range varies among patients and instruments used. * In a normal person, 7 waves are produced in the first 100 milliseconds