If the following features were placed in chronological order which would come fourth?

The answer is D. Whooping cough in childhood (E) results in the formation of bronchiectasis (A) by pulmonary collapse and imperfect resolution of pneumonia; bronchiectasis disturbs the pulmonary haemodynamics such that bronchopulmonary anastomoses (B) are formed which result in raised pulmonary artery pressure (D); right ventricular hypertrophy with congestive cardiac failure (C) may follow.