This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Which of the following does not cause hyperventilation 
Select and explain. 
A. Anxiety, B. High altitude, C. Pulmonary hypertension, D. Psychotic illness
C: Pulmonary hypertension
Answer: C: Pulmonary hypertension 
Explanation: 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