**Core Concept**
Mineral acid poisoning, particularly hydrochloric acid, can cause severe chemical burns and systemic toxicity. The antidote is chosen based on the type of acid and its concentration, but the goal is to neutralize the acid and prevent further damage.

**Why the Correct Answer is Right**
The antidote for mineral acid poisoning, including hydrochloric acid, is sodium bicarbonate (baking soda). Sodium bicarbonate works by neutralizing the acid, thereby reducing the pH and preventing further damage to tissues. This is achieved through a chemical reaction that converts the acid into a less harmful compound. Specifically, sodium bicarbonate reacts with hydrochloric acid to form water, carbon dioxide, and sodium chloride.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not address the specific need to neutralize the acid. While activated charcoal may be used to absorb certain toxins, it is not effective in neutralizing mineral acids.
**Option B:** This option is incorrect because it is not specific to mineral acid poisoning. Lactate or bicarbonate may be used in various medical conditions, but they are not the antidote for mineral acid poisoning.
**Option C:** This option is incorrect because it is not the primary treatment for mineral acid poisoning. While supportive care, including decontamination and wound care, is essential, it does not address the need to neutralize the acid.

**Clinical Pearl / High-Yield Fact**
Remember that the antidote for mineral acid poisoning is sodium bicarbonate, which works by neutralizing the acid through a chemical reaction. This is a key concept in emergency medicine and toxicology.

**Correct Answer:** A. Sodium bicarbonate.