Sure, let's analyze the pronunciation of the underlined parts in each option:

1. The underlined parts are:
- A. arr**ow** (pronounced /oʊ/)
- B. l**ou**d (pronounced /aʊ/)
- C. m**o**ldy (pronounced /oʊ/)
- D. p**ou**ltry (pronounced /oʊ/)

The odd one out is B. **loud** because it has a different vowel sound (/aʊ/).

2. The underlined parts are:
- A. ba**s**ilisk (pronounced /s/)
- B. bi**s**on (pronounced /s/)
- C. ba**s**ic (pronounced /s/)
- D. ba**s**in (pronounced /s/)

All options have the same pronunciation for the underlined part (/s/). There is no odd one out.

3. The underlined parts are:
- A. su**b**tlety (the "b" is silent)
- B. inde**b**tedness (the "b" is silent)
- C. bom**b**ard (the "b" is pronounced)
- D. com**b**ing (the "b" is silent)

The odd one out is C. **bombard** because the "b" is pronounced.

4. The underlined parts are:
- A. ben**e**volent (pronounced /ɪ/)
- B. cont**e**nt (pronounced /ə/)
- C. mol**e**cules (pronounced /ə/)
- D. t**e**chnique (pronounced /ɛ/)

The odd one out is D. **technique** because it has a different vowel sound (/ɛ/).

5. The underlined parts are:
- A. con**sc**ience (pronounced /ʃ/)
- B. bron**ch**itis (pronounced /k/)
- C. **sh**uttle (pronounced /ʃ/)
- D. **ch**auffeur (pronounced /ʃ/)

The odd one out is B. **bronchitis** because it has a different consonant sound (/k/).

So, the answers are:
1. B. loud
2. None (all are pronounced the same)
3. C. bombard
4. D. technique
5. B. bronchitis