The correct answer: Ethambutol can cause optic neuritis, which is an inflammation of the optic nerve. The earliest signs are decreased visual acuity and loss of red-green color discrimination. This is a serious side effect that requires immediate discontinuation of the drug to prevent permanent vision loss.

The correct answer is Strawberry Tongue.

In the context of a Streptococcus pyogenes infection (Scarlet Fever), the tongue typically undergoes two stages:

1. White Strawberry Tongue: During the first few days, the tongue is covered in a white fur or coating. The fungiform papillae (tiny bumps) become red and swollen, poking through the white layer like seeds on a strawberry.

2. Red Strawberry Tongue: After 4 or 5 days, the white coating sloughs off (peels away), leaving the entire tongue appearing beefy, bright red, and glistening with enlarged bumps.

Quick Fact: While "Strawberry Tongue" is the classic sign for Scarlet Fever, it can also be seen in Kawasaki Disease and Toxic Shock Syndrome, so doctors always look for the accompanying sandpaper rash to confirm the diagnosis!

The correct answer: 0.9% Normal Saline infusion at 1,000 mL/hr. The initial priority in DKA is rapid fluid resuscitation to prevent hypovolemic shock and dilute glucose levels.

The correct answer: Laryngeal stridor and restless behavior. Stridor indicates acute airway obstruction, often due to edema or tetany, requiring immediate emergency action.

The correct answer: The lung has fully re-expanded. Tidaling (the rise and fall of water with respiration) stops when the lung is fully expanded or if there is an obstruction in the system.