Both antibody-dependent and independent complement pathway converge on which complement component

**Core Concept**
The complement system is a crucial part of the immune system, providing a rapid and efficient defense against pathogens. It involves a cascade of proteolytic reactions, resulting in the activation of various complement components. The **complement pathway** can be activated through different mechanisms.

**Why the Correct Answer is Right**
The correct answer is related to the point of convergence of both the **antibody-dependent (classical)** and **antibody-independent (alternative and lectin)** complement pathways. This convergence occurs at the level of the **C5 component**, where both pathways lead to the formation of **C5 convertase**, an enzyme that cleaves C5 into C5a and C5b, initiating the terminal pathway.

**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because it represents an earlier step in the complement cascade.
**Option B:** Similarly, this option is incorrect as it is involved in the initiation of the classical pathway.
**Option D:** This is also incorrect as it is a part of the terminal pathway but not the point of convergence.

**Clinical Pearl / High-Yield Fact**
The convergence of both pathways at **C5** is a critical step, as it leads to the formation of the **membrane attack complex (MAC)**, which can lyse pathogens. Understanding this point of convergence is essential for comprehending the complement system's role in immune defense.

**Correct Answer:** C. C5