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: Pediatrics
A child presents with recurrent bouts of severe cough followed by an audible whoop. Which of the following is considered the best type of specimen to isolate the organism and confirm the diagnosis. 
Select and explain. 
A. Nasopharyngeal swab, B. Cough plate, C. Throat Swabs, D. Anterior Nasal Swab
A: Nasopharyngeal swab
Answer: A: Nasopharyngeal swab 
Explanation: Presence of recurrent bouts of severe cough followed by an audible whoop suggests a diagnosis of pertusis (Whooping cough).
Nasopharyngeal Swab is the single best specimen to isolate the organism from the options provided.