Anatomical dead space is increased by all /except
C i.e. Massive Pleural effusion - Pleural effusion normally tends to decrease physiological dead space initially. However when massive it also decreases anatomical dead space. Atropine, halothane are bronchodialators, so T anatomical dead space. Inspiration may also streatch airways to anatomical dead space.
Atropine
Halothane
Massive pleural effusion
Inspiration