📊 Biology
Q. What is the main cause of primary hypertension?
  • (A) Exact cause unknown
  • (B) Kidney disease
  • (C) Heart attack
  • (D) Infection
✅ Correct Answer: (A) Exact cause unknown

Explanation: Primary hypertension develops over time with no identifiable single cause.

Explanation by: Roshan
Primary hypertension develops over time with no identifiable single cause.

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