Consequences of cystic fibrosis: changes in ___ secretions lead to an impaired ability to clear ___, resulting in ___ infections, progressive ___, and ___ obstruction.
a) Blood; mucus; respiratory; pancreas; lung
b) Mucus; blood; lung; respiratory; pancreas
c) Mucus; blood; pancreas; respiratory; lung
d) Blood; mucus; pancreas; lung; respiratory