This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infectious disease, Subject name: Pediatrics
[{'content': 'A child with complaints of cough. Characteristic inspiratory whoop. Sample for investigation is ________ \nSelect and explain. \nA. Nasopharyngeal swab, B. Tracheal aspiration, C. Cough plate culture, D. Sputum culture', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Peussis is an acute highly contagious respiratory tract infection caused by Bordetella peussis. - it is called whooping cough due to the characteristic whoop produced by the air rushing in during inspiration through half open glottis. - diagnosis is mainly based on clinical symptoms. - the sample of choice is nasopharyngeal swab. Reference : Ghai essential pediatrics, eighth edition, pg no:242,243', 'role': 'assistant'}]