*/*_Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about __________ ppm.?

*/*_Ethyl mercaptan is added to the Doctor negative LPG for facilitati

1.	/_Ethyl mercaptan is added to the Doctor negative LPG for facilitating the detection of its leakage (by bad odour) to the extent of about __________ ppm.?
A.	1
B.	50
C.	5000
D.	10000
Answer» C. 5000