Which of the following does not cause hyperventilation: (A) Anxiety, (B) High altitude, (C) Pulmonary hypertension, (D) Psychotic illness
Answer is C. CAUSES OF HYPERVENTILATION:
1. Hypoxemia
a. High altitude
b. Pulmonary disease
c. Cardiac shunts
2. Pulmonary disorders
a. Pneumonia
b. Interstitial pneumonitis, fibrosis, edema
c. Pulmonary emboli, vascular disease
d. Bronchial asthma
e. Pneumothorax
f. Chest wall disorders
3. Cardiovascular disorders 
a. Congestive heart failure
b. Hypotension
4. Metabolic disorders
a. Acidosis (diabetic, renal, lactic)
b. Hepatic failure
5. Neurologic and psychogenic disorders
a. Psychogenic or anxiety hyperventilation
b. Central nervous system infection, tumours
6. Drug-induced 
a. Salicylates
b. Methylxanthine derivatives
c. Adrenergic agonists
d. Progesterone
7. Miscellaneous
a. Fever, sepsis
b. Pain c. Pregnancy