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Choose the correct word from the given options as one word substitution for the given phrase:

An instrument that records heart's action.

Solution

✅ Correct Option: 1

The suffix -graph denotes the instrument that records, while -gram denotes the record produced. So a cardiograph is the instrument that records the heart's action, and a cardiogram is the tracing it produces. "Cardiac" is an adjective and "cartography" is map-making.

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