Which of the following is NOT listed as a sign or symptom of lead poisoning in the material?

• A. Irritability
• B. Cognitive delay
• C. Headache
• D. Ringing in the ears

Answer: (D)

Lead’s neurotoxic effects in exposed individuals typically show up as behavioral or cognitive changes and headaches, especially in children. Irritability and cognitive delays are classic early signs because they reflect disruption of brain development and function, while headaches are a common, non-specific symptom of toxin exposure. Ringing in the ears is not normally listed as a sign or symptom in standard lead-exposure material; tinnitus is more often linked to noise exposure or ototoxic drugs, and while prolonged lead exposure can affect hearing, the specific symptom of ringing is not a common hallmark in these resources. So, the item about ringing in the ears isn’t included among the listed signs in that material.