This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Achromatopsia is due to lesion in which area of occipital coex? 
Select and explain. 
A. Area v5, B. Area v7, C. Area v8, D. Area v4
D: Area v4
Answer: D: Area v4 
Explanation: Area v4 REF: Yanoff's ophthalmology p- 1300 Patients who have acquired, central cerebral achromatopsia (inability to identify colors) may have complete loss or miss only one primary color. The isolation of single color defects links with research performed in macaque monkeys, which showed that an area of prestriate coex, identified as area V4, contains neurons that respond to specific color stimuli. Patients with cerebral achromatopsia generally describe objects as "washed out" or "faded." Patients still may be able to use contrast clues to separate the edge of one intense color from another. If two colors or a color and a shade of gray match pseudoisochromatically, however, patients demonstrate a distinct inability to isolate colored targets. Despite the achromatopsia, other pas of the parvicellular system may remain intact. Patients may have normal visual acuity and contrast sensitivity. Postmoem and radiological studies of these patients reveal bilateral lesions of the inferior occipital coex.