Which medication type is a known drug-induced cause of secondary hypertension?

Oral contraceptive pills are known to be a drug-induced cause of secondary hypertension. They can lead to increased blood pressure in certain individuals, particularly in those who may already have risk factors such as a history of hypertension or obesity. The mechanism behind this side effect is thought to involve estrogen and its effects on the renin-angiotensin system, leading to fluid retention and changes in vascular resistance.

In contrast, while beta-blockers do have some effects on blood pressure, they are primarily used to treat hypertension and do not usually cause secondary hypertension. Statins are primarily used for lowering cholesterol levels and do not have a significant association with hypertension. Proton pump inhibitors, which reduce stomach acid, are generally not implicated in causing hypertension. Hence, the association of oral contraceptive pills with secondary hypertension makes them the correct choice in this context.