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In mammals, the sympathetic nerves arise from thoraco-lumbar nerves (autonomic nervous system).

1. Sympathetic nerves arise from thoraco-lumbar nerves.
2. Sympathetic nerves are part of the autonomic nervous system.
3. Sympathetic nerves are found in mammals.
4. Sympathetic nerves control involuntary actions.

Correct answer: Sympathetic nerves arise from thoraco-lumbar nerves.

Solution

The stem directly states that sympathetic nerves arise from thoraco-lumbar nerves, so the matching option is the one about their origin. The other choices are true general facts, but they do not answer the specific statement given.

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