AIIMS 2018 Botany Respiratory System Assertion Reason Question

Option C is correct because both the assertion and reason accurately describe the physiological response to allergens or irritants entering the respiratory tract. When dust particles are inhaled, the immune system releases histamine, leading to symptoms such as sneezing, a runny nose, and eye redness due to increased vascular permeability and mucus secretion. Other options are not applicable as they do not provide alternative assertions or reasons related to the question, leaving option C as the only relevant choice. Understanding the role of histamine in allergic responses is crucial in comprehending how the body reacts to environmental irritants.