**Core Concept**
A Randomized Controlled Trial (RCT) is a type of scientific experiment that aims to reduce bias when testing the efficacy of a medical intervention by randomly allocating participants into treatment and control groups. RCTs are considered the gold standard in clinical research due to their ability to establish causality between the intervention and the outcome.

**Why the Correct Answer is Right**
In an RCT, randomization is used to minimize confounding variables and ensure that the treatment and control groups are comparable in terms of demographic and clinical characteristics. This allows researchers to infer causality between the intervention and the outcome, making RCTs a crucial tool in evidence-based medicine. The randomization process involves assigning participants to either the treatment or control group based on chance, rather than using a predetermined method.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because RCTs do involve randomization, which is a key feature that distinguishes them from other types of studies.
**Option B:** This option is incorrect because RCTs are designed to minimize bias, not introduce it.
**Option C:** This option is incorrect because RCTs typically involve a comparison between a treatment group and a control group, which is essential for establishing causality.

**Clinical Pearl / High-Yield Fact**
One of the key advantages of RCTs is their ability to establish causality, which is essential for making informed decisions in clinical practice. However, RCTs can be time-consuming and expensive to conduct, which is why they are often used to evaluate interventions that have a significant impact on patient outcomes.

**Correct Answer: A. This option is incorrect because RCTs do involve randomization, which is a key feature that distinguishes them from other types of studies.**