Question: Pulmonary hypertension occurs as a consequence of: 
 Options:  <1> Bronchoconstriction and inflammation of the upper respiratory tract. <2> Bronchoconstriction and inflammation of the lower respiratory tract. <3> Bronchiectasis and pulmonary collapse. <4> Vasoconstriction of the arterioles of the systemic circulation. <5> Vasoconstriction of the arterioles of the pulmonary circulation.
5