**Core Concept**
Pregnancy and skin lesions in a family member raise the suspicion of a dermatological condition that may be contagious or exacerbated by hormonal changes. The presentation of itchy hand lesions in a pregnant woman and her husband suggests a dermatosis that may be related to pregnancy or a systemic condition.

**Why the Correct Answer is Right**
The condition described is likely scabies, caused by the mite Sarcoptes scabiei. During pregnancy, the skin is more sensitive, and hormonal changes can worsen the symptoms. The fact that the husband is also affected supports the diagnosis of scabies, which is a highly contagious ectoparasitic infection. Scabies is treated with topical or oral antiparasitic medications, such as permethrin or ivermectin, which are effective against the mites and their eggs.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not address the contagious nature of the condition or the specific symptoms of itchy hand lesions in a pregnant woman.
**Option B:** This option is incorrect because it does not consider the possibility of a systemic condition or a dermatosis that may be exacerbated by pregnancy.
**Option C:** This option is incorrect because it does not take into account the fact that the husband is also affected, which suggests a contagious condition.

**Clinical Pearl / High-Yield Fact**
Scabies is a common condition that can be easily misdiagnosed, especially in pregnant women. A high index of suspicion and a thorough physical examination are essential for diagnosing scabies, which requires prompt treatment to prevent transmission to others.

**Correct Answer:** B. Ivermectin