Here are the words with different stress patterns from the others in each group:

1. A. **scientist** - Stress on the first syllable. Others have stress on the second syllable.
2. B. **dramatic** - Stress on the second syllable. Others have stress on the first syllable.
3. A. **prehistoric** - Stress on the third syllable. Others have stress on the second syllable.
4. A. **medical** - Stress on the first syllable. Others have stress on the second or third syllable.
5. A. **physical** - Stress on the first syllable. Others have stress on the second or third syllable.
6. A. **terrific** - Stress on the second syllable. Others have stress on the first syllable.
7. A. **arithmetic** - Stress on the third syllable. Others have stress on the second syllable.
8. B. **geographic** - Stress on the second syllable. Others have stress on the first syllable.
9. A. **classical** - Stress on the first syllable. Others have stress on the second syllable.
10. A. **oceanic** - Stress on the second syllable. Others have stress on the first syllable.
11. A. **affect** - Stress on the second syllable. Others have stress on the first syllable.
12. A. **cholera** - Stress on the first syllable. Others have stress on the second syllable.
13. B. **radiation** - Stress on the third syllable. Others have stress on the second syllable.
14. A. **seriously** - Stress on the first syllable. Others have stress on the second syllable.
15. D. **aquatic** - Stress on the second syllable. Others have stress on the first syllable.

For the second part:
VI. Choose a word whose main stress pattern is the same as that of the others:
1. A. **autography** - Stress pattern corresponds with residential and unsuccessfully.
2. B. **residential** - Stress pattern corresponds with autography and unsuccessfully.
3. D. **unsuccessfully** - Stress pattern corresponds with autography and residential.

Here, "autography," "residential," and "unsuccessfully" have the same type of stress pattern.