question: Q:A 24-year-old male with cystic fibrosis is brought to the emergency room by his mother after he had difficulty breathing. He previously received a lung transplant 6 months ago and was able to recover quickly from the operation. He is compliant with all of his medications and had been doing well with no major complaints until 2 weeks ago when he began to experience shortness of breath. Exam reveals a decreased FEV1/FVC ratio and biopsy reveals lymphocytic infiltration. Which of the following components is present in the airway zone characteristically affected by the most likely cause of this patient's symptoms?? 
  {'A': 'Cartilage', 'B': 'Goblet cells', 'C': 'Pseudostratified columnar cells', 'D': 'Simple cuboidal cells', 'E': 'Stratified cuboidal cells'},