Which condition would lead to disqualification for a driver suffering from allergic rhinitis?

A driver suffering from allergic rhinitis may face disqualification if they experience severe conjunctivitis affecting their vision. This condition can significantly impact a driver's ability to see clearly, which is vital for safe operation of a vehicle. Visual acuity and the ability to respond to road conditions are critical components of driving safety; hence, any impairment that affects these capabilities can lead to disqualification.

Conjunctivitis can cause symptoms like redness, tearing, and swelling of the eyes, which can distract or hinder a driver's ability to focus on the road. Ensuring that vision meets the regulatory standards for driving is paramount, and severe conjunctivitis could fail to meet those standards.

In contrast, controlled sneezing, standard allergy medications, and a mild upper respiratory infection may not significantly impair driving ability, as they do not generally lead to severe visual impairment or pose a substantial risk to road safety. Therefore, the presence of significant visual disturbances caused by severe conjunctivitis is a more critical concern that warrants disqualification.