**Question:** Dose of DDT for effective control of mosquitoes is -

**Core Concept:** DDT (Dichloro-Diphenyl-Trichloroethane) is an organochlorine insecticide, widely used as an insecticide for controlling mosquitoes and other pests.

**Why the Correct Answer is Right:** The correct answer is **B**. DDT is an insecticide, and its primary mode of action is to disrupt the nervous system of the target organism. Mosquitoes are particularly susceptible to DDT due to their physiological characteristics. The lethal dose for mosquitoes is relatively low, making DDT an effective tool for mosquito control.

**Why Each Wrong Option is Incorrect:**

A. **Incorrect:** DDT is an organochlorine insecticide, and its primary mode of action is to disrupt the nervous system. However, the correct dosage for effective mosquito control is not provided in this question.

C. **Incorrect:** DDT is an organochlorine insecticide, but the correct dosage for effective mosquito control is not provided in this option.

D. **Incorrect:** DDT is an organochlorine insecticide, but the correct dosage for effective mosquito control is not provided in this option.

**Why DDT is used for mosquito control:**

DDT is used for mosquito control because it has a rapid onset of action, is highly effective, and can be applied in various forms, such as sprays, dusts, and impregnated bednets. However, its use has been controversial due to environmental concerns and the development of insecticide resistance in mosquito populations.

**Clinical Pearl:** In recent years, alternative methods have been developed for mosquito control, such as larvicides, insect growth regulators, and environmental management strategies. These methods aim to reduce the overall reliance on chemical insecticides like DDT to minimize environmental concerns and promote sustainable mosquito control practices.

**Correct Answer Explanation:** The correct answer is B. DDT is an organochlorine insecticide that disrupts the nervous system of mosquitoes, making it effective for mosquito control. However, the question does not provide the specific dosage required for the desired effect. The correct dosage may depend on factors like mosquito species, environmental conditions, and the desired level of mosquito reduction.

For a better understanding of the correct dosage and safer mosquito control methods, refer to the Clinical Pearl section above.