Study the given flow chart and select the option that correctly identifies P, Q and R.
| P | Q | R | |
| A | Nitrogen | Oxygen | Carbon dioxide |
| B | Oxygen | Carbon dioxide |
Nitrogen |
| C | Nitrogen | Carbon dioxide |
Oxygen |
| D | Carbon dioxide |
Nitrogen | Oxygen |
Study the given flow chart and select the option that correctly identifies P, Q and R.
| P | Q | R | |
| A | Nitrogen | Oxygen | Carbon dioxide |
| B | Oxygen | Carbon dioxide |
Nitrogen |
| C | Nitrogen | Carbon dioxide |
Oxygen |
| D | Carbon dioxide |
Nitrogen | Oxygen |