**Question:** Average Mental IQ according to Wechsler's Scale is -

A. 85
B. 90-110
C. 110-120
D. 130

**Core Concept:** Wechsler's Scale is a widely used intelligence assessment tool to evaluate an individual's cognitive abilities. It is based on the premise that intelligence can be divided into separate but interrelated factors, such as Verbal Comprehension, Perceptual Reasoning, Working Memory, and Processing Speed.

**Why the Correct Answer is Right:** According to Wechsler's Scale, the average IQ is defined as the quotient of an individual's mental age divided by their chronological age, multiplied by 100. In this case, the correct answer (90-110) represents a range of mental ages, reflecting the average cognitive functioning of an individual.

**Why Each Wrong Option is Incorrect:**

A. 85 - This option is slightly lower than the average IQ range and doesn't accurately represent the average mental age according to Wechsler's Scale.

B. 130 - This option is significantly higher than the average IQ range, which is not consistent with the definition of average intelligence.

C. 110-120 - This option is also higher than the average IQ range, not aligning with the scale's definition of average mental age.

**Clinical Pearl:** It is essential for medical professionals to understand intelligence assessment tools like Wechsler's Scale when evaluating patients' cognitive abilities, mental status, or diagnosing conditions affecting cognition.

**Correct Answer:** B. 90-110 - This option accurately represents the average mental age according to Wechsler's Scale, indicating an individual's average intelligence.