The 1918 flu pandemic, also called the Spanish Flu was caused by?

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The 1918 flu pandemic, also called the Spanish Flu was caused by? Answer: H1N1 influenza A virus

The Spanish Flu pandemic of 1918–1919 was caused by the H1N1 strain of the influenza A virus. It infected a large portion of the global population and caused millions of deaths worldwide, making it one of the deadliest pandemics in history.

Question context

This question is part of 🔬 General Science within the broader 🌐 Current Affairs & GK subject and appears in the SPSC – Sindh Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.