Okay, let's tackle this question about the Oedipus complex. The user wants a detailed explanation for a medical student preparing for exams like NEET PG or USMLE. First, I need to recall what the Oedipus complex is according to Freud. It's a psychoanalytic concept, so the core concept here is developmental psychology, specifically Freud's stages of psychosexual development.

The Oedipus complex occurs during the phallic stage, which Freud placed around ages 3 to 6. During this stage, a child develops unconscious sexual desires towards the opposite-sex parent and feelings of rivalry with the same-sex parent. This is part of normal psychological development according to Freud, though it's a controversial topic.

Now, the question is asking in which age group it's seen. The correct answer would be the phallic stage, so the age range is 3-6 years. The options probably include other stages like oral (0-1), anal (1-3), latency (6-12), or genital (puberty onwards). Each incorrect option corresponds to different stages.

For the explanation, I need to detail why the correct answer is right, mentioning the phallic stage and the age range. Then, for each wrong option, explain which stage they belong to and why they don't fit. The clinical pearl should highlight the age range and maybe a mnemonic to remember Freud's stages. Finally, confirm the correct answer with the letter and text.

**Core Concept**
The Oedipus complex is a psychoanalytic theory by Sigmund Freud describing unconscious sexual desires toward the opposite-sex parent and rivalry with the same-sex parent during the **phallic stage** of psychosexual development. It occurs between **ages 3 and 6**, reflecting intrapsychic conflict central to Freudian developmental psychology.

**Why the Correct Answer is Right**
The phallic stage (ages 3–6) is when the Oedipus complex emerges as part of Freud’s theory. During this stage, children develop **electra complex** (in girls) or **oedipus complex** (in boys), characterized by attraction to the opposite-sex parent and jealousy toward the same-sex parent. Resolution of this conflict is theorized to lead to the formation of the superego and gender identity. This stage precedes the latency period (6–12 years) and follows the anal stage (1–3 years).

**Why Each Wrong Option is Incorrect**
**Option A: 0–1 year (oral stage)** – This corresponds to the oral stage, where fixation might lead to dependency or oral habits, not the Oedipus complex.
**Option B: 1–3 years (anal stage)** – The anal stage involves toilet training and control issues; it precedes the phallic stage.
**Option C: 6–12 years (latency stage)** – During latency, sexual urges are dormant, and the Oedipus complex has resolved or been repressed.

**Clinical Pearl / High-Yield Fact**
Remember Freud’s stages with the acronym **O.A.P.L.G.**:
**O**ral (0–1), **A**nal (1–3), **P**hallic (3–6), **L**atency (6–12), **G**enital (

✓ Correct Answer: C. Boys of 3 - 5 years of age