Which of these responses is not voluntarily controlled by the brain?

Sneezing is not voluntarily controlled by the brain. Sneezing is a reflex that is triggered by various stimuli, such as dust, bright light, or a strong odor. The brain does not have direct control over the sneezing reflex, which is instead controlled by the autonomic nervous system. The autonomic nervous system is responsible for controlling many unconscious bodily functions, such as breathing, heart rate, and digestion, and does not respond to voluntary control. When a person sneezes, the muscles in the nose and chest contract rapidly, expelling air and any irritants that may be present in the nasal passages. While a person may be able to suppress a sneeze temporarily, they cannot prevent it from happening entirely.