Question

which biological factor may be involved in the development of mental illness?
○ infections
○ left - handedness
○ height - weight ratio
○ birth order in a family

Explanation:

To determine the biological factor in mental illness development, we analyze each option:

• Infections: Some infections (e.g., certain viral or bacterial infections) can impact the brain and contribute to mental health issues, making this a valid biological factor.
• Left - handedness: There's no established direct link to mental illness development as a biological factor for causation.
• Height - weight ratio: Primarily related to physical health (e.g., obesity - related issues) and not a direct biological factor in mental illness development.
• Birth order in a family: This is a social - psychological factor related to family dynamics, not a biological factor.

Answer:

A. infections