Tetracycline in children causes:
**Core Concept**
Tetracycline is a broad-spectrum antibiotic that can bind to calcium ions in growing bones and teeth, leading to irreversible damage and discoloration. This phenomenon is known as tooth discoloration or enamel fluorosis.
**Why the Correct Answer is Right**
Tetracycline's ability to bind to calcium ions is due to its chemical structure, which contains a chelating group that can form a stable complex with calcium ions. This binding process inhibits the normal mineralization of tooth enamel, resulting in permanent discoloration. The use of tetracycline in children, especially during the period of tooth eruption and development, increases the risk of this adverse effect.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the question, as it does not address the specific adverse effect of tetracycline in children.
**Option B:** While tetracycline can cause gastrointestinal side effects, such as nausea and vomiting, this is not the primary concern when administering the drug to children.
**Option C:** Tetracycline resistance is a concern in the treatment of bacterial infections, but it is not related to the question of tooth discoloration in children.
**Clinical Pearl / High-Yield Fact**
It is essential to avoid administering tetracycline to children under the age of 8 years, as their teeth are still developing, and the risk of tooth discoloration is highest during this period.
**Correct Answer:** C. Tetracycline-induced tooth discoloration.