Which type of sampling method ensures that every individual in a population has an equal chance of being selected?

Correct Answer: B

Rationale: The correct answer is B: Random sampling. Random sampling ensures that every individual in a population has an equal chance of being selected, leading to unbiased results. This method involves selecting participants purely by chance, without any specific criteria, increasing the representativeness of the sample. Convenience sampling (A) involves selecting the most readily available individuals, leading to potential bias. Purposive sampling (C) involves selecting participants based on specific characteristics, also leading to bias. Quota sampling (D) involves selecting a specific number of participants based on predetermined quotas, which can introduce bias if not done randomly.

Correct Answer: A

Rationale: The correct answer is A: OS. In medical terminology, "OS" stands for "oculus sinister," which means the left eye. This Latin term is commonly used in medical charts and prescriptions to indicate the left eye specifically. Explanation: - "OD" refers to "oculus dexter," which means the right eye. - "OU" stands for "oculus uterque," meaning both eyes. - Choice D is incorrect as it does not provide a valid medical term for the left eye. Therefore, the correct answer is A because it accurately represents the left eye in medical terminology.

Correct Answer: B

Rationale: The correct answer is B because relapsing fever is characterized by recurrent episodes of fever followed by periods of normal temperature. This pattern of fever, normal, fever, normal repeats over time. Choice A describes a pattern of consistently alternating fever and normal days, which is not characteristic of relapsing fever. Choice C and D do not provide any relevant information to describe the pattern of relapsing fever.

Correct Answer: B

Rationale: Step 1: Feet together reduces stability and increases risk of falling. Step 2: Carrying object with feet together restricts balance and proper weight distribution. Step 3: Feet apart provides a wider base, enhancing stability and reducing strain on the body. Summary: Option B is correct as it promotes proper body mechanics by ensuring a wider base of support. Choices A, C, and D are incorrect as they do not address the importance of base support and can lead to increased risk of injury.

Correct Answer: B

Rationale: The correct answer is B (30 minutes) because of the refractory period that occurs in men after ejaculation. During this time, men typically experience a decrease in sexual arousal and are unable to achieve another erection or ejaculation immediately. This refractory period lasts around 30 minutes on average, although it can vary among individuals. Choice A (None) is incorrect because it does not align with the physiological refractory period that occurs after ejaculation. Choice C (Anytime at will) is incorrect as it implies that men can immediately engage in sexual activity again after ejaculation, which is not typically the case due to the refractory period. Choice D is incomplete, so it cannot be considered as a valid option.