The carrier is a person who carries a disease and

Correct Answer: C

Rationale: The correct answer is C because carriers can transmit the disease to others even if they do not show symptoms. Carriers harbor the pathogen and can spread it through various means. Choice A is incorrect because carriers may not display symptoms. Choice B is incorrect as carriers do not have control over the signs and symptoms. Choice D is incorrect as carriers are capable of transmitting the disease.

Correct Answer: B

Rationale: The correct answer is B: Seam side down on the bed. This is because placing the seam side down ensures a smoother surface for sleeping and prevents any discomfort or irritation from the seam rubbing against the body. Tucking the seam into the mattress (Choice C) may create unevenness and discomfort. Having the seam side up (Choice A) or turning it over at one end of the bed (Choice D) can also cause discomfort and disrupt the overall smoothness of the bed. Therefore, choosing option B is the most practical and comfortable way to position the seam of the bottom sheet.

Correct Answer: D

Rationale: The correct answer is D: Orangewood sticks. Orangewood sticks are commonly used for nail care due to their sturdy yet gentle properties. They are soft enough to push back cuticles and clean under nails without causing damage. Rosewood, Greasewood, and Sandalwood sticks are not typically used for nail care purposes. Rosewood is more commonly used in furniture making, Greasewood is a type of shrub, and Sandalwood is known for its aromatic properties, not for nail care.

Correct Answer: B

Rationale: Carbohydrates are the correct answer as they are the primary source of energy for the body and provide fiber for digestive health. Fats are also an energy source but are not the main provider. Proteins are important for building and repairing tissues, not primarily for energy. Vitamins are essential for various bodily functions but do not supply energy or fiber.

Correct Answer: C

Rationale: The correct answer is C: Heartburn. When the sphincter muscle joining the esophagus is weakened, it allows stomach acid to flow back into the esophagus, causing a burning sensation in the chest known as heartburn. This occurs due to the reflux of stomach contents into the esophagus. Gastroesophageal discomfort (choice A) is vague and not specific to the weakened sphincter muscle. Ulcers (choice B) are typically caused by bacteria or excessive use of NSAIDs, not by a weakened sphincter. Malabsorption (choice D) is related to the inability to absorb nutrients properly in the intestines, not the esophagus. Therefore, the correct answer is C because it directly correlates with the consequence of a weakened sphincter muscle in the esophagus.