2.
									
										Coagulation, in physiology, is the process by which a blood clot forms to reduce blood loss after damage to a blood vessel. Coagulation of blood do not occur inside human body due to the presence of:
									
								
															
														
																									
										A:
											Haemoglobin 
									
																										
										B:
											 Heparin 
									
																										
										C:
											Fibrin 
									
																										
										D:
											Plasma
									
																								 
							
																
									The answer is:
										B
									
								
														
							
								
								
							
							
							
								