**Question:** Following latrines are suitable for camps and temporary use except

A. Chemical toilets
B. Composting toilets
C. Portable toilets
D. Septic tanks

**Core Concept:** The correct answer is a type of sanitation system that is not suitable for temporary or camp use.

**Why the Correct Answer is Right:** Septic tanks are inappropriate for temporary or camp use due to their reliance on a permanent sewer system and drainage infrastructure. They require a connection to a sewer or drainage system, making them unsuitable for situations where such facilities are not available or not feasible.

**Why Each Wrong Option is Incorrect:**

A. Chemical toilets: These are portable toilets that use chemicals to treat and dispose of waste, making them suitable for temporary use in camps and other off-grid locations.
B. Composting toilets: These convert human waste into compost through the process of aerobic decomposition, making them suitable for temporary or camp use where a proper sewage disposal system is not available.
C. Portable toilets: Similar to chemical toilets, portable toilets are designed for temporary use, especially in outdoor events, construction sites, or camps.

**Clinical Pearl / High-Yield Fact:**

Composting toilets and portable toilets are valuable options for sustainable sanitation in remote areas or temporary settings where conventional sewage systems are not feasible. These toilets help maintain hygiene and reduce environmental pollution by providing a safe and discreet waste disposal method.

**Correct Answer:** D. Septic tanks