Choose the most appropriate word from the options given below to complete the following sentence.
A person suffering from Alzheimer's disease ______ short-term memory loss.
A. Experienced B. Has experienced C. Is experiencing D. Experiences
GATE 2014 · General Aptitude · Most Appropriate Word · medium
Answer: D. Experiences
Classify the type of statement: The sentence makes a general statement about what someone with Alzheimer's disease characteristically undergoes. This is a permanent truth about the disease, not a past event (rules out A) or a temporary ongoing action (rules out C). 'Has experienced' (B) implies completion, which conflicts with the ongoing nature of the disease.
Select the simple present form: 'A person suffering from Alzheimer's disease experiences short-term memory loss.' This uses simple present to state a defining symptom — exactly the correct usage.