**Core Concept**
Crossed aphasia, also known as conduction aphasia, is a type of aphasia characterized by difficulty in repeating words and phrases, while spontaneous speech and comprehension remain relatively intact. This condition occurs due to damage to the fibers connecting the left and right hemispheres of the brain, particularly in the corpus callosum.

**Why the Correct Answer is Right**
The correct answer, A, is correct because crossed aphasia typically results from a right hemispherical lesion in a right-handed individual. This type of lesion disrupts the communication between the left hemisphere, which is responsible for language, and the right hemisphere, which is involved in the integration and processing of linguistic information. The corpus callosum, a bundle of fibers connecting the two hemispheres, plays a crucial role in this process. When the corpus callosum is damaged, the communication between the hemispheres is disrupted, leading to crossed aphasia.

**Why Each Wrong Option is Incorrect**
**Option B:** This option is incorrect because a right hemispherical lesion in a left-handed person would not typically result in crossed aphasia. Left-handed individuals often have a more bilateral brain organization, which may reduce the likelihood of crossed aphasia.
**Option C:** This option is incorrect because a left hemispherical lesion in a left-handed person would not result in crossed aphasia, as the lesion is in the language-dominant hemisphere of a left-handed person.
**Option D:** This option is incorrect because "left handed lesion" is not a clear or accurate description of a brain lesion. A more accurate description would be "left hemispherical lesion" or "left hemisphere damage."

**Clinical Pearl / High-Yield Fact**
It's essential to remember that crossed aphasia is often associated with lesions in the corpus callosum, particularly in the splenium, which is the posterior part of the corpus callosum. This knowledge can help clinicians identify the underlying cause of crossed aphasia and guide treatment decisions.

**✓ Correct Answer: A. Right hemispherical lesion in right handed person**